CN104933997A - Liquid crystal display device and driving method thereof - Google Patents

Abstract

A method for driving a liquid crystal display device includes the following steps: receiving original display data; rearranging the original display data into new display data according to at least one scan drive mode; adjusting a scan drive sequence corresponding to the scan drive mode according to a control signal; transmitting the new display data to a display panel through a data line; wherein the arrangement sequence of the original display data corresponds to the scan drive sequence before adjustment, and the arrangement sequence of the new display data corresponds to the scan drive sequence after adjustment according to the scan drive mode.

Description

Liquid crystal display device and driving method thereof

technical field

The present invention relates to a liquid crystal display device, and in particular to a method for driving a liquid crystal display device with improved operating temperature.

Background technique

With the advancement of human civilization, imaging devices have long become common products in daily life, and displays are an indispensable component of these imaging devices. Users read information through the display, and even indirectly control the operation of the device through the display. Among them, liquid crystal display (LCD) has been widely used in various products requiring liquid crystal display devices due to its thin and light volume, low power consumption and other advantages. In recent years, it has even replaced traditional cathode ray tube (CRT) displays. the trend of. Liquid crystal display devices are widely used in modern information equipment such as televisions, notebooks, computers, mobile phones, and personal digital assistants due to their advantages of light weight, small size, and low power consumption.

However, as the size of the liquid crystal display panel becomes larger and larger, the resolution of the liquid crystal display panel is higher and higher, and the RC loading of the panel is also larger and larger, so that the operating temperature of each driving circuit is also higher. come higher. Therefore, how to save the power consumption of the driving circuit to reduce the operating temperature may become an important issue.

Contents of the invention

An embodiment of the present invention provides a display device, including a display panel, a timing controller, a data driver, and a scan driver. The timing controller receives raw display data. The data driver is coupled to the timing controller. The data driver receives the original display data and rearranges the original display data into new display data through its internal line buffer according to at least one scan driving mode, and transmits the original display data through the data line The new display data is sent to the display panel. The scan driver is coupled to the timing controller, the scan driver receives the sequence signal transmitted by the data driver, and adjusts the scan driving sequence corresponding to the scan driving mode according to the sequence signal. The sequence of the original display data corresponds to the scanning driving sequence before adjustment, and the sequence of the new display data corresponds to the scanning driving sequence adjusted according to the scanning driving mode.

In one embodiment, while the data driver rearranges the original display data according to the scan driving mode, the data driver transmits a sequence signal to the scan driver according to the scan driving mode to adjust the scan driving order.

In one embodiment, the scan driver includes M scan sub-circuits, and the display panel is divided into M display blocks, and each scan sub-circuit transmits N scan driving signals to corresponding The display block of , where M and N are positive integers.

In one embodiment, each of the plurality of scan sub-circuits adjusts the scan driving sequence to correspond to the scan driving mode according to the sequence signal received.

An embodiment of the present invention further provides a driving method for the above-mentioned liquid crystal display device. The driving method includes the following steps: receiving original display data; rearranging the original display data into new display data according to at least one scanning driving mode; adjusting the scanning driving order corresponding to the scanning driving mode according to control signals; and passing through a plurality of data lines Send new display data to the display panel. The sequence of the original display data corresponds to the scanning driving sequence before adjustment, and the sequence of the new display data corresponds to the scanning driving sequence adjusted according to the scanning driving mode.

In summary, the liquid crystal display device and its driving method proposed by the embodiments of the present invention can reduce the switching times of the high and low level voltages of the data driver while keeping the display screen unchanged, thereby reducing the operating temperature of the data driver .

In order to enable a further understanding of the features and technical content of the present invention, please refer to the following detailed description and accompanying drawings of the present invention, but these descriptions and accompanying drawings are only used to illustrate the present invention, rather than claiming the rights of the present invention any limitation on the scope.

Description of drawings

FIG. 1 is a schematic diagram of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a liquid crystal display device according to another embodiment of the present invention.

FIG. 3 is a schematic diagram of a liquid crystal display device according to another embodiment of the present invention.

FIG. 4 is a table diagram of scan driving modes according to the present embodiment.

FIG. 5 is a schematic diagram of a data driver rearranging original display data according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of a data driver adjusting a scan driving sequence according to an embodiment of the present invention.

FIG. 7 is a flowchart of a driving method according to an embodiment of the present invention.

Description of main component symbols:

100, 200, 300: liquid crystal display device

110: Timing controller

120: Data drive

122: Line buffer

130: scan driver

1311～131M: scanning sub-circuit

140: display panel

B1～BM: display block

CS1, CS2: Control signal

DL, DL1～DL6: data line

DATA: original display data

NDATA: new display data

SES: sequential signal

SL, SL1～SLN: scanning line

S710, S720, S730, S740: steps

Detailed ways

Various exemplary embodiments will be described more fully hereinafter with reference to the accompanying drawings, in which some exemplary embodiments are shown. However, inventive concepts may be embodied in many different forms and should not be construed as limited to the illustrative embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the inventive concept to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. Like numbers indicate like elements throughout.

It will be understood that, although the terms first, second, third etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another. Thus, a first element discussed below could be termed a second element without departing from the teachings of the inventive concept. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

[Example of Liquid Crystal Display Device]

Please refer to FIG. 1 , which is a schematic diagram of a liquid crystal display device according to an embodiment of the present invention. In this embodiment, the liquid crystal display device 100 includes a timing controller 110 , a data driver 120 , a scan driver 130 , and a display panel 140 , wherein the data buffer 120 includes at least one line buffer 122 . The data driver 120 is coupled to the timing controller 110 and the display panel 140 . The scan driver 130 is coupled to the timing controller 110 and the display panel 140 .

Compared with the high operating temperature of the known technology, the present disclosure provides a method that can reduce the switching times of high and low level voltages in the data driver 120 while keeping the image frame unchanged when the display panel 140 displays image data. To reduce the operating temperature of the data drive 120 . In this embodiment, the data driver 120 receives the original display data DATA transmitted by the controller 110, and the data driver 120 rearranges the original display data DATA according to at least one scan driving mode and through its internal line buffer 122 into Compared with the original display data DATA, the new display data NDATA is only arranged differently from the original display data DATA, and the visual effect displayed on the display panel 140 is the same. It should be noted that the arrangement sequence of the original display data DATA corresponds to the scan driving sequence before adjustment, and the new display data NDATA corresponds to the scan driving sequence adjusted by the timing controller 110 according to the scan driving mode. The scan driving mode in the present disclosure is a mode in which the data driver 120 can reduce the switching times of the high and low level voltages in the original display data DATA when transmitting the data driving signal.

In this embodiment, the data driver 120 is used to provide a data driving signal to the display panel 140 through the data line DL, wherein the data driving signal refers to a grayscale voltage signal. The data driver 120 receives the display data NDATA and the control signal CS1 transmitted by the timing controller 110 and rearranges the original display data DATA into new display data NDATA through the line buffer 122 according to the scanning driving mode set by the designer, wherein The new display data NDATA corresponds to the data drive signal.

The scan driver 130 is used for providing scan driving signals to the display panel 140 through the scan lines SL. The scan driver 130 respectively receives the control signal CS2 transmitted by the timing controller 110 and the sequence signal SES transmitted by the data driver 120 , and adjusts the scan driving sequence corresponding to the scan driving mode according to the sequence signal SES. While the data driver 120 uses the line buffer 122 to rearrange the original display data DATA according to the scan driving mode, the data driver 120 transmits the sequence signal SES to the scan driver 130 according to the scan driving mode to adjust the scan driving sequence of the scan driving signal.

In short, the data driver 120 of the present disclosure can rearrange the order of the original display data DATA according to the scan driving mode and through the line buffer 122 to output the new display data NDATA to the display panel 140 . At the same time, the data driver 120 outputs the sequence signal SES to the scan driver 130 according to the scan driving mode, so that the scan driver 130 adjusts the scan driving sequence of the scan driving signal. Of course, the adjusted scan driving sequence of the scan driving signals corresponds to the arrangement sequence of the new display data NDATA, so as to maintain the visual display effect on the display panel 140 unchanged.

In order to describe the operation process of the liquid crystal display device 100 described in this disclosure in more detail, at least one of the multiple embodiments will be further described below.

In the following multiple embodiments, the parts different from the above-mentioned embodiment of FIG. 1 will be described, and the remaining omitted parts are the same as those of the above-mentioned embodiment of FIG. 1 . In addition, like reference numerals or numerals designate like elements for convenience of description.

[Another embodiment of the liquid crystal display device]

Please refer to FIG. 2 , which is a schematic diagram of a liquid crystal display device according to another embodiment of the present invention. Different from the embodiment in FIG. 1 above, the scan driver 130 includes a plurality of scan sub-circuits 1311-131M, and the display panel 140 is divided into display blocks B1-BM corresponding to the plurality of scan sub-circuits 1311-131M. Each of the plurality of scanning sub-circuits 1311-131M transmits N scanning driving signals to the corresponding display blocks B1-BM through N scanning lines SL1-SLN according to the received sequence signal SES, wherein M and N is a positive integer. Moreover, each of the plurality of scan sub-circuits 1311-131M adjusts the scan driving sequence of the scan driving signals according to the received sequence signal SES, so as to correspond to the scan driving mode or correspond to the arrangement sequence of the new display data NDATA. It is worth mentioning that, for the convenience of description and understanding of the present disclosure, in this embodiment, the number of scanning lines coupled to each scanning sub-circuit 1311-131M is the same; in another embodiment, each scanning sub-circuit The numbers of scan lines coupled to the circuits 1311-131M may not be completely the same or partially the same, and are not limited to this embodiment.

Further speaking, after the data driver 120 receives the original display data DATA, the data driver 120 can adopt more than two scanning driving modes and adjust the sequence of the original display data DATA through the line buffer 122, and display the generated new data. The data NDATA is sent to the display panel 140 . At the same time, the data driver 120 transmits the sequence signal SES to the scanning sub-circuits 1311-131M according to the scanning driving mode adopted, and the scanning sub-circuits 1311-131M adjust the scanning of the scanning driving signal according to the sequence adjustment information carried in the sequence signal SES. The driving sequence is in accordance with the scan driving mode corresponding to individual requirements. Next, each of the scanning sub-circuits 1311-131M transmits the scanning driving signal to the corresponding display blocks B1-BM in the display panel 140 through the scanning lines SL1-SLN. Therefore, when the data driver 120 adopts multiple different scan driving modes, the corresponding scan driving modes of the display blocks B1 -BM are also different.

In order to describe the temperature-improving driving method adopted by the liquid crystal display device 200 described in this disclosure in more detail, a more specific quantization example (ie, N=4, M=2) will be used for further description below. Generally, when the system operates a large-sized liquid crystal display panel, a pattern is used to determine whether the operating temperature of the integrated circuit is too high. The following is an example of one of the patterns, and is not limited to this embodiment.

[Further Embodiment of Liquid Crystal Display Device]

Please refer to FIG. 3 and FIG. 4 at the same time. FIG. 3 is a schematic diagram of a liquid crystal display device according to another embodiment of the present invention. FIG. 4 is a table diagram of scan driving modes according to the present embodiment. Before proceeding to the following description, it should be explained here that the following example assumes that the scan driver 130 has two scan sub-circuits 1311-1312, and the display panel 140 is divided into two display blocks B1-B2, wherein the display area The block B1 has four scanning lines SL1-SL4 coupled to the scanning sub-circuit 1311, and the display block B2 has four scanning lines SL5-SL8 coupled to the scanning sub-circuit 1312, wherein the scanning driving modes corresponding to the scanning sub-circuits 1311 and 1312 are Similarly, in another embodiment, the scan driving modes corresponding to the scan sub-circuits 1311 and 1312 may be different, and the present embodiment is not limited thereto. The display panel 140 has six data lines DL1 - DL6 coupled to the data driver 120 . The symbol “3F” in the display panel 140 represents a positive or negative bright spot, corresponding to a high level voltage. The symbol "0" in the display panel 140 represents a dark spot, corresponding to a low level voltage.

In the table of FIG. 4 , in order to express the situation of all scan driving modes under 4 scan lines (N=4), the parts with oblique lines represent dark dots, and the parts without oblique lines represent bright dots. The digital part (such as 1-2-3-4 or 1-2-4-3) represents the scanning driving order of the scanning lines SL1~SL4 or SL5~SL8 transmitting the scanning driving signal, for example, 1-2-4-3 represents the scanning driving The scanning driving sequence of the signal is scanning line SL1 -> scanning line SL2 -> scanning line SL4 -> scanning line SL3. Moreover, it can be known from FIG. 4 that the switching times of the high and low level voltages corresponding to each scan driving mode. The higher the number of switching times, the greater the power consumption of the data driver 120, so the operating temperature of the data driver 120 will be higher. In this embodiment, there are 24 scanning driving modes, and 8 scanning driving modes have 3 times. The number of switching times (same as the original operating temperature), the switching times of the remaining 16 scan driving modes are all less than 3 times, that is, the number of switching times is 2 times or 1 time (which can reduce the operating temperature). Therefore, if the liquid crystal display device 300 wants to reduce the operating temperature of the data driver 120 , the liquid crystal display device 300 needs to use a scan driving mode with a switching number less than three.

Here, it is described as an example that the scanning sub-circuits 1311 and 1312 adopt the same second scanning driving mode. After the timing controller 110 receives the original display data DATA, the timing controller 110 transmits the control signal CS1 and the original display data DATA to the data driver 120 and transmits the control signal CS2 to the scan driver 130 . The data driver 120 rearranges the received original display data DATA according to the scan driving mode (1-2-4-3) and through the line buffer 122 . Please refer to FIG. 5 together. FIG. 5 is a schematic diagram of a data driver rearranging original display data according to an embodiment of the present invention. As shown in FIG. 5 , the data driver 120 transmits the third column and the fourth column, the seventh column and the eighth column in the original display data DATA according to the scan driving mode (1-2-4-3) and through the line buffer 122. The columns are swapped to generate new display data NDATA. At this time, the data driver 120 transmits the sequence signal SES to the scanning sub-circuits 1311-1312 in the scanning driver 130 according to the scanning driving mode (1-2-4-3), so as to adjust the scanning of the scanning driving signals of the scanning sub-circuits 1311-1312. drive sequence. Please refer to FIG. 6 together. FIG. 6 is a schematic diagram of a data driver adjusting a scan driving sequence according to an embodiment of the present invention. As shown in FIG. 6 , the scan sub-circuits 1311 - 1312 exchange the scan lines SL3 and SL4 , and exchange the scan lines SL7 and SL8 to adjust the scan driving order to conform to the scan driving mode (1-2-4-3). In other words, the scan driving sequence of the scan sub-circuit 1311 is changed from scan line SL1 -> scan line SL2 -> scan line SL3 -> scan line SL4 to scan line SL1 -> scan line SL2 -> scan line SL4 -> scan line SL3. The scan driving sequence of the scan sub-circuit 1312 is changed from scan line SL5 -> scan line SL6 -> scan line SL7 -> scan line SL8 to scan line SL5 -> scan line SL6 -> scan line SL8 -> scan line SL7.

Therefore, when the scanning driving mode is 1-2-4-3, when the scanning sub-circuit 1311 transmits the scanning driving signal to the first column of the display block B1 in the display panel 140 through the scanning line SL1, the data driver 120 The first column of the new display data NDATA is transmitted to the first column of the display block B1 through the data lines DL1˜DL6. Next, when the scanning sub-circuit 1311 transmits the scanning driving signal to the second column of the display block B1 in the display panel 140 through the scanning line SL2, the data driver 120 will transmit the second column of the new display data NDATA through the data lines DL1˜ DL6 is sent to the second column of display block B1. Next, when the scanning sub-circuit 1311 transmits the scanning driving signal to the fourth column of the display block B1 in the display panel 140 through the scanning line SL4, the data driver 120 will transmit the third column of the new display data NDATA through the data line DL1 ~DL6 is sent to the fourth column of display block B1. Finally, when the scanning sub-circuit 1311 transmits the scanning driving signal to the third column of the display block B1 in the display panel 140 through the scanning line SL3, the data driver 120 will transmit the fourth column of the new display data NDATA through the data lines DL1- DL6 is sent to the third column of display block B1.

When the scanning sub-circuit 1312 transmits the scanning driving signal to the first column of the display block B2 in the display panel 140 through the scanning line SL5, the data driver 120 transmits the fifth column of the new display data NDATA through the data lines DL1-DL6 to display the first column of block B2. Next, when the scanning sub-circuit 1312 transmits the scanning driving signal to the second column of the display block B2 in the display panel 140 through the scanning line SL6, the data driver 120 will transmit the sixth column of the new display data NDATA through the data lines DL1- DL6 is sent to the second column of display block B2. Next, when the scanning sub-circuit 1312 transmits the scanning driving signal to the fourth column of the display block B2 in the display panel 140 through the scanning line SL8, the data driver 120 will transmit the seventh column of the new display data NDATA through the data line DL1 ~DL6 is sent to the fourth column of display block B2. Finally, when the scanning sub-circuit 1312 transmits the scanning driving signal to the third column of the display block B2 in the display panel 140 through the scanning line SL7, the data driver 120 will transmit the eighth column of the new display data NDATA through the data lines DL1- DL6 is sent to the third column of display block B2.

It is worth mentioning that if the liquid crystal display device 300 adopts a scanning driving mode with a switching frequency of 1 (for example, the third type of 1-3-2-4), this will save power more than a scanning driving mode with a switching frequency of 2. power consumption to further reduce the operating temperature of the data drive 120. Moreover, the scanning sub-circuits 1311 and 1312 of this embodiment can use different scanning driving modes. For example, the scanning sub-circuit 1311 adopts the sixth scanning driving mode (1-4-2-3), while the scanning sub-circuit 1312 adopts the 17th scanning driving mode. The scan driving mode (3-2-4-1) is not limited to this embodiment. Moreover, the above-mentioned working mechanism is not limited to dividing the display panel 140 into multiple display blocks. The spirit of the present disclosure is that the data driver 120 rearranges the original display data DATA into new display data NDATA according to a scan driving mode. Afterwards, the scan driver 130 will correspondingly adjust the scan driving sequence of the scan driving signals according to the received sequence signal SES.

Accordingly, the present disclosure can reduce the switching times of the high and low level voltages of the data driver 120 to reduce the power consumption of the data driver 120 while maintaining the desired display screen unchanged, thereby reducing the power consumption of the data driver 120 or the liquid crystal display. The operating temperature of the device 300 .

[One embodiment of driving method]

Please refer to FIG. 7 , which is a flowchart of a driving method according to an embodiment of the present invention. The method described in this example can be implemented on the liquid crystal display device shown in FIG. 1 to FIG. 3 , so please refer to FIG. 1 to FIG. 3 for easy understanding. In this embodiment, the driving method for improving the operating temperature of the data drive includes the following steps. Receive original display data (step S710). Rearrange the original display data into new display data according to at least one scan driving mode (step S720). The scan driving sequence corresponding to the scan driving mode is adjusted according to the sequence signal (step S730). Send new display data to the display panel through the data cable (step S740). Wherein, the arrangement sequence of the original display data corresponds to the scanning driving sequence before adjustment, and the arrangement sequence of the new display data corresponds to the scanning driving sequence adjusted according to the scanning driving mode.

The relevant details of each step of the driving method of the liquid crystal display device have been described in detail in the embodiments of FIG. 1 to FIG. 6 above, and will not be repeated here. It should be noted here that the steps in the embodiment in FIG. 7 are only for convenience of description, and the order of the steps in the embodiment of the present invention is not used as a limiting condition for implementing various embodiments of the present invention.

[Possible efficacy of the embodiment]

To sum up, the liquid crystal display device and its driving method provided by the embodiments of the present invention can reduce the switching times of the high and low level voltages of the data driver while maintaining the display screen that the user wants to watch, so as to The power consumption of the data drive is saved, thereby reducing the operating temperature of the data drive.

The above descriptions are only examples of the present invention, and are not intended to limit the patent scope of the present invention.

Claims (8)

1. A liquid crystal display device, characterized in that, comprising: a display panel; a timing controller for receiving an original display data; A data driver, coupled to the timing controller, the data driver receives the original display data and rearranges the original display data into a new display data according to at least one scan driving mode and through its internal line buffer, and sending the new display data to the display panel via a data line; and a scan driver, coupled to the timing controller, the scan driver receives a sequence signal sent by the data driver, and adjusts the scan drive sequence corresponding to the scan drive mode according to the sequence signal, The sequence of the original display data corresponds to the scan driving sequence before adjustment, and the sequence of the new display data corresponds to the scan driving sequence adjusted according to the scan driving mode. 2. The liquid crystal display device according to claim 1, wherein when the data driver rearranges the original display data according to the scan driving mode, the data driver transmits the sequence signal to the Scan Drivers to adjust the scan driver order. 3. The liquid crystal display device according to claim 1, wherein the scan driver comprises M scan sub-circuits, and the display panel is divided into M display blocks, each of the scan sub-circuits according to the sequence signal and Through the N scan lines, N scan driving signals are sent to the corresponding display blocks, wherein M and N are positive integers. 4. The liquid crystal display device as claimed in claim 3, wherein each of the scanning sub-circuits adjusts a scanning driving sequence to correspond to the scanning driving mode according to the sequence signal received. 5. A driving method, characterized in that the driving method comprises: receiving an original display data; rearranging the original display data into a new display data according to at least one scan driving mode; adjusting the scan driving sequence corresponding to the scan driving mode according to a control signal; and sending the new display data to a display panel via a plurality of data lines; Wherein the arrangement sequence of the original display data corresponds to the scanning driving sequence before adjustment, and the arrangement sequence of the new display data corresponds to the scanning driving sequence adjusted according to the scanning driving mode, Wherein the driving method is used in the liquid crystal display device as claimed in claim 1 . 6. The driving method according to claim 5, wherein the timing controller transmits the sequence signal corresponding to the scan driving mode to the scan driver while rearranging the original display data according to the scan driving mode to adjust the scan driver sequence. 7. The driving method according to claim 6, wherein the scan driver comprises M scan sub-circuits, and the display panel is divided into M display blocks, each of the scan sub-circuits transmits the control signal according to the Through the N scan lines, N scan driving signals are sent to the corresponding display blocks, wherein M and N are positive integers. 8. The driving method according to claim 7, wherein each of the scanning sub-circuits adjusts a scanning driving sequence to correspond to the scanning driving mode according to the sequence signal received.