TWI581232B - Display device - Google Patents

Description

Display device

The present invention relates to a display device, and more particularly to a display device that shares scan time.

According to the development of LCD panel technology, more and more products are applied to LCD panels, such as tablet computers, mobile phones, televisions and bank tellers. Almost all of the above products are sold and used in various countries. However, in the low temperature environment, the resistance of the internal components of the liquid crystal panel will increase with the decrease of the ambient temperature, resulting in the RC of each pixel in the overall liquid crystal panel. The load increases. Thus, controlling the voltage of the transistor in the pixel, for example, a gate voltage, takes a long time to reach the normal level. Moreover, in the case that the scanning mode is unchanged, the time taken to subtract the gate voltage to reach the normal level will reduce the charging time of the pixel, resulting in insufficient voltage clamping of the liquid crystal, and the problem of reduced display contrast. .

Please refer to the first figure, which is a timing diagram of the scanning mode of the conventional display device. For example, in the first figure, generally, each frame time F1-F4 is the same scanning mode, that is, during the time t0 to the odd scanning time t1, the scan driving circuit scans the first odd-numbered scanning lines 31, and then, in the odd-numbered scanning. The scan driving circuit scans the first even scan line 32 during the time t1 to the even scan time t2. Thereafter, during the even scan time t2 to the odd scan time t5, the scan driving circuit continuously scans the next scan line, in other words, the scan drive circuit sequentially scans the second odd scan line 33, the second even scan line 34, and sequentially. The third odd-numbered scan line 35 is completed until all scan lines have been scanned. In other words, the scan driving circuit sequentially scans each odd scan line 31, 33 and each even scan line 32, 34, respectively, from the first frame time F1 to the fourth frame time F4.

According to the above, the polarity conversion mode of the scanning mode is as shown in the second A-C diagram, and the second A-C diagram is the schematic diagram of the polarity inversion of the conventional display device, and the initial electrical polarity of the pixels 11-14. As shown in FIG. 2A, after scanning all the pixels 11-14 through the first frame time F1, the electrical polarity of the pixels 11-14 in the second A picture is changed to the second B picture, and the same, after the first After the second frame time F2 scans all the pixels 11-14, the electrical polarity of the pixels 11-14 in the second B picture changes to the second C picture, and the electrical polarity of the pixels 11-14 in the second C picture. The electrical polarity of the pixels 11-14 in the second A diagram is the same, so it is conventional to perform a polarity inversion with two screen updates.

Therefore, in the above general scanning mode and the polarity switching process, in the low temperature environment of the liquid crystal panel device, the overall charging capability of the transistor in the pixel cannot reach the expected standard of the normal temperature, so the scanning method causes the charging time of the pixel to decrease. The voltage clamping difference of the liquid crystal is insufficient.

Therefore, the present invention is directed to the innovation of the scanning mode and the polarity switching of the liquid crystal panel without any change of the liquid crystal panel, and effectively improves the phenomenon that the liquid crystal panel is insufficient in low-temperature charging capability.

One of the objects of the present invention is to provide a display device that shares a scan time, which can improve the phenomenon that the liquid crystal panel has insufficient charging capability.

To achieve the above objective, the present invention provides a display device including a display area, a plurality of data lines, a data driving circuit, a plurality of scanning lines, and a scan driving circuit. The display area includes a plurality of pixels arranged in an array; the plurality of data lines are coupled to the pixels; the data driving circuit is coupled to the data lines and generates a plurality of data signals to change electrical polarity of the pixels; the plurality of scanning lines include at least one An odd scan line and at least one even scan line, the scan lines being coupled to the images The scan driving circuit is coupled to the scan lines and generates a plurality of scan signals to control the pixels to receive the data signals for screen update; wherein a screen update period includes a first frame time and a second frame Time, a third frame time, and a fourth frame time, scanning the odd scan lines at the first frame time and the third frame time, at the second frame time and the fourth frame time , scanning the even scan lines.

To achieve the above objective, the present invention provides a display device including a display area, a plurality of data lines, a data driving circuit, a plurality of scanning lines, and a scan driving circuit. The display area includes a plurality of pixels arranged in an array; the data driving circuit is coupled to the data lines and generates a plurality of data signals to change electrical polarity of the pixels; and the plurality of scanning lines includes at least one odd scanning line and at least one even scanning line The odd-numbered scan lines are adjacent to the even-numbered scan lines; the scan drive circuit scans the odd-numbered scan lines and the even-numbered scan lines, and the electrical properties of the pixels coupled to the odd-numbered scan lines at a first frame time and a third frame time The electrical polarity of the pixels coupled to the even scan lines is the same as the electrical polarity of the pixels at a second frame time and a fourth frame time. The electrical polarity of the pixels coupled to the odd scan lines is opposite to the even scan. The electrical polarity of the pixels to which the lines are coupled.

1‧‧‧ display device

2‧‧‧Data Drive Circuit

3‧‧‧Scan drive circuit

10‧‧‧Display area

11‧‧‧ pixels

12 ‧ ‧ pixels

13‧‧‧ pixels

14‧‧‧ pixels

21‧‧‧Information line

22‧‧‧Information line

23‧‧‧Information line

24‧‧‧Information line

25‧‧‧Information line

31‧‧‧First odd scan line

32‧‧‧First even scan line

33‧‧‧second odd scan line

34‧‧‧second even scan line

35‧‧‧ third odd scan line

F1‧‧‧ first frame time

F2‧‧‧Second frame time

F3‧‧‧ Third frame time

F4‧‧‧Fourth frame time

Time t0‧‧‧

T1‧‧‧ odd scan time

T2‧‧‧ even scan time

T3‧‧‧ odd scan time

T4‧‧‧ even scan time

T5‧‧‧ odd scan time

The first figure is a timing diagram of a scanning mode of a conventional display device; the second A-C is a schematic diagram of polarity reversal of a conventional display device; and the third figure is a A schematic diagram of an embodiment of a display device; a fourth diagram: a timing diagram of an embodiment of a shared scan time of the display device of the present invention; and a fifth A-fif E diagram: the polarity of the display device of the present invention A schematic of one embodiment is reversed.

In order to give your reviewers a better understanding and understanding of the features and effects of the present invention, please follow the description of the examples and the accompanying drawings, as explained below:

Please refer to the third figure, which is a schematic diagram of an embodiment of the display device of the present invention. As shown in the figure, the display device 1 of the present invention comprises a data driving circuit 2, a scanning driving circuit 3 and a display area 10. The display area 10 includes a plurality of pixels 11-14 arranged in an array. In this embodiment, four pixels are used. For illustrative purposes, the display area 10 has more pixels. The position of each pixel is formed by interleaving the plurality of data lines 21-25 and the plurality of scanning lines 31-35. Similarly, in this embodiment, five data lines and scanning lines are used as descriptions. However, the display device has more information. Line and scan line. The data driving circuit 2 is coupled to the data lines 21-25. The data lines 21-25 are coupled to the pixels 11-14. Thus, the data driving circuit 2 couples the pixels 11 through the data lines 21-25. -14. When the data driving circuit 2 generates the plurality of data signals, the data signals can be transmitted to the pixels 11-14 by the data lines 21-25, and the electrical polarity of the pixels 11-14 is changed.

The scan driving circuit 3 is coupled to the plurality of scan lines 31-35. The scan lines 31-35 are also coupled to the pixels 11-14. The scan lines 31-35 include a plurality of odd scan lines 31, 33, 35 and The complex even scan lines 32, 34, and each odd scan line 31, 33, 35 are adjacent to each even scan line 32, 34, respectively. Thus, the scan driving circuit 3 couples the pixels 11-14 through the scan lines 31-35. When the scan driving circuit 3 generates the plurality of scan signals, the scan signals 31-35 can be used to transmit the scan signals to the pixels 11-14, and the pixels 11-14 are controlled to receive the data signals for performing. Screen update.

The scanning method for improving the charging ability of the liquid crystal panel of the present invention is as shown in the fourth figure, which is a timing chart of an embodiment of the shared scanning time of the display device of the present invention. A frame update period includes a first frame time F1, a second frame time F2, a third frame time F3, and a fourth frame time F4, and each frame time F1-F4 includes a plurality of odd scans. Time t1, t3 and complex even scan time t2, t4, and the odd scan times t1, t3 are substantially equal to the even scans Between t2 and t4. During the first frame time F1 of the first update screen, during the time t0 to the even scan time t2, the scan driving circuit 3 scans the first odd scan line 31, and during the even scan time t2 to the even scan time t4, the scan driving circuit 3 Scanning the second odd scan line 33. The second frame time F2 of the second update screen, wherein, during the time t1 to the even scan time t3, the scan driving circuit 3 scans the first even scan line 32, and during the even scan time t3 to the even scan time t5, the scan drive Circuit 3 scans the second even scan line 34.

In the third frame time F3 of the third update screen, the scan driving circuit 3 scans the first odd scan line 31 and the second odd scan line 33 for the fourth frame time F4 of the fourth update screen. The scan driving circuit 3 scans the first odd-numbered scan lines 31 and the second odd-numbered scan lines 33. Thus, the scanning method of the present invention scans the odd scanning lines 31 and 33 at the first frame time F1 and the third frame time F3, and scans the second frame time F2 and the fourth frame time F4. These even scan lines 32, 34. Moreover, the odd scan times t1, t3 of the first frame time F1 and the even scan times t2, t4 are simultaneously used to scan the odd scan lines 31, 33, and the odd scans of the second frame time F2 The times t1, t3 are simultaneously used to scan the even scan lines 32, 34 with the even scan times t2, t4.

Similarly, at the odd scan times t1, t3 of the third frame time F3 and the even scan times t2, t4, the scan driving circuit 3 sequentially scans the odd scan lines 31, 33. The scan driving circuit 3 sequentially scans the even scan lines 32, 34 at the odd scan times t1, t3 of the fourth frame time F4 and the even scan times t2, t4. Therefore, at different frame times, the odd scan times t1, t3 and the even scan times t2, t4 are simultaneously used to scan the odd scan lines 31, 33 or the even scan lines 32, 34 to control The pixels 11-14 receive the corresponding data signals.

Furthermore, comparing the scanning mode of the fourth drawing of the present invention with the scanning mode of the conventional second drawing, the odd scanning times t1, t3, and t5 of the conventional scanning mode are used for scanning odd scanning lines. 31, 33, 35, the even scan times t2, t4 are used to scan the even scan lines 32, 34, which do not share the scan time. However, the scanning method of the present invention is to share the scan time. In other words, at the second frame time F2, the odd scan line 31 is not scanned for the first time, but the odd scan time t1 of the first odd scan line 31 is made first. The even scan line 32 scans. Similarly, at the first frame time F1, the first even scan line 32 is not scanned, but the even scan time t2 of the first even scan line 32 is caused by the first odd scan line 31. Scanning, that is, at the first frame time F1, the scan driving circuit 3 scans each odd scan line 31, 33 without scanning each even scan line 32, 34, and scans the scan drive circuit 3 at the second frame time F2. Each even scan line 32, 34 is scanned without scanning each odd scan line 31, 33.

However, the present invention is not limited to first scanning the odd scan lines 31, 33 at the first frame time F1, and may also change the first frame time F1 to scan the even scan lines 32, 34 first. In other words, the scan driving circuit 3 scans each of the even scan lines 32, 34 at the first frame time F1 without scanning each of the odd scan lines 31, 33, and the scan drive circuit 3 scans each odd number at the second frame time F2. The lines 31, 33 are scanned without scanning each even scan line 32, 34. As such, the scanning method of the present invention can increase the scanning time of each pixel 11-14, and increase the time when the transistors of pixels 11-14 are turned on to increase the charging capability, and the opening time is increased by two times compared with the second figure. However, the present invention does not limit the extent of the increase in the opening time, which can be designed by itself.

5A-5E, which is a schematic diagram of one embodiment of polarity inversion of the display device of the present invention. As shown in the figure, the pixels 11-14 respectively have a positive polarity and a negative polarity, wherein the fifth A picture shows the initial electrical polarity of the pixels 11-14, and during a picture update period, each message The total time of the frame times F1-F4 is fixed, but the number of scanned scan lines is half of the original, so the scan time allocated to each scan line is twice the original, in other words, the scanning method of the present invention is Only the odd scan lines 31, 33 or the even scan lines 32, 34 are scanned in the frame time F1-F4. Thus, the polarity inversion of one picture in the scanning mode of the present invention requires a total of four frame times F1-F4 to complete.

In the above, the fifth B to the fifth E are the changes in the electrical polarity of the pixels 11-14, and in the fifth E, the electrical polarity of the pixels 11-14 and the fifth A pixel 11- The electrical polarity of 14 is the same, so the polarity inversion of the present invention needs to be completed by the four frame times F1-F4 of the fifth to fifth E-pictures. The electrical polarity of the pixels 11-14 of the third frame time F3 (fifth D picture) is opposite to the first frame time F1 (fifth B picture) due to the innovative scanning mode of the present invention. The electrical polarity of the pixels 11-14, and the electrical polarity of the pixels 11-14 of the fourth frame time F4 (fifth E picture) is also opposite to the second frame time F2 (fifth C picture) The electrical polarity of these pixels 11-14.

Furthermore, the first pixel time F1 and the third frame time F3, the pixels 11-12 coupled to the odd-numbered scan lines 31 have the same polarity as the pixels 13 coupled to the even-numbered scan lines 32. The electrical polarity of the -14 is the second frame time F2 and the fourth frame time F4. The electrical polarity of the pixels 11-12 coupled to the odd scanning line 31 is opposite to the coupling of the even scan lines 32. The electrical polarity of the pixels 13-14. Moreover, since the odd scan times t1, t3 and the even scan times t2, t4 can be shared, the pixels 11 coupled to the odd scan lines 31 at the odd scan time t1 and the even scan time t2 of the first frame time F1 -12 performs polarity conversion. During the odd scan time t1 and the even scan time t2 of the second frame time F2, the pixels 13-14 coupled to the even scan lines 32 perform polarity switching. In other words, the pixels 11 - 12 coupled to the odd-numbered scan lines 31 and the pixels 13 - 14 coupled to the even-numbered scan lines 32 are polarity-switched at different frame times.

In summary, the present invention provides a display device including a display area, a plurality of data lines, a data driving circuit, a plurality of scanning lines, and a scan driving circuit. The display area includes a plurality of pixels arranged in an array; the plurality of data lines are coupled to the pixels; the data driving circuit is coupled to the data lines and generates a plurality of data signals to change electrical polarity of the pixels; the plurality of scanning lines Included in the at least one odd-numbered scan line and at least one even-numbered scan line, the scan lines are coupled to the pixels; the scan driving circuit is coupled to the scan lines and generates a plurality of scan signals to control the pixels to receive the data signals for display And updating, wherein the first frame time, the second frame time, the third frame time, and the fourth frame time are included in the first frame time and the third frame time And scanning the odd scan lines to scan the even scan lines at the second frame time and the fourth frame time.

Alternatively, the present invention provides a display device including a display area, a plurality of data lines, a data driving circuit, a plurality of scanning lines, and a scan driving circuit. The display area includes a plurality of pixels arranged in an array; the data driving circuit is coupled to the data lines and generates a plurality of data signals to change electrical polarity of the pixels; and the plurality of scanning lines includes at least one odd scanning line and at least one even scanning line The odd-numbered scan lines are adjacent to the even-numbered scan lines; the scan drive circuit scans the odd-numbered scan lines and the even-numbered scan lines, and the electrical properties of the pixels coupled to the odd-numbered scan lines at a first frame time and a third frame time The electrical polarity of the pixels coupled to the even scan lines is the same as the electrical polarity of the pixels at a second frame time and a fourth frame time. The electrical polarity of the pixels coupled to the odd scan lines is opposite to the even scan. The electrical polarity of the pixels to which the lines are coupled.

31‧‧‧First odd scan line

32‧‧‧First even scan line

33‧‧‧second odd scan line

34‧‧‧second even scan line

F1‧‧‧ first frame time

F2‧‧‧Second frame time

F3‧‧‧ Third frame time

F4‧‧‧Fourth frame time

Time t0‧‧‧

T1‧‧‧ odd scan time

T2‧‧‧ even scan time

T3‧‧‧ odd scan time

T4‧‧‧ even scan time

Claims (11)

A display device comprising: a display area comprising a plurality of pixels arranged in an array; a plurality of data lines coupled to the pixels; and a data driving circuit coupled to the data lines to generate a plurality of data signals to change the An electrical polarity of the plurality of pixels; the plurality of scan lines comprising a plurality of odd scan lines and a plurality of even scan lines, wherein the scan lines are coupled to the pixels; and a scan driving circuit coupled to the scan lines to generate a plurality of scan signals Controlling the pixels to receive the data signals for updating the screen, wherein a screen update period includes a first frame time, a second frame time, a third frame time, and a fourth frame time. The first frame time and the third frame time are sequentially scanned for the odd scan lines, and the even scan lines are sequentially scanned for the second frame time and the fourth frame time. The display device of claim 1, wherein the first frame time, the second frame time, the third frame time, and the fourth frame time respectively comprise a plurality of odd scan times and a plurality of times The even scan time, the odd scan time and the even scan time are simultaneously used to sequentially scan the odd scan lines or the even scan lines. The display device of claim 1, wherein the scan driving circuit sequentially scans the odd scan lines to control the odd scan time and the even scan time of the third frame time. The pixels receive the corresponding data signals, and the odd scan times of the fourth frame time and the even scan times, the scan driving circuit sequentially scans the even scan lines to control the corresponding pixel receptions. These information signals. The display device of claim 1, wherein the pixels have a positive polarity and a negative polarity, respectively. The display device of claim 4, wherein the third frame time The electrical polarity of the pixels is opposite to the electrical polarity of the pixels in the first frame time, and the electrical polarity of the pixels in the fourth frame time is opposite to the pixels in the second frame time. Electrical polarity. A display device comprising: a display area comprising a plurality of pixels arranged in an array; a plurality of data lines coupled to the pixels; and a data driving circuit coupled to the data lines to generate a plurality of data signals to change the An electrical polarity of the plurality of pixels; the plurality of scan lines comprising a plurality of odd scan lines and a plurality of even scan lines adjacent to the even scan lines; and a scan driving circuit for scanning the odd scan lines and the even scan lines The electrical polarity of the pixels coupled to the odd-numbered scan lines is the same as the electrical polarity of the pixels coupled to the even-numbered scan lines at a first frame time and a third frame time. The second frame time is a fourth frame time, and the electrical polarity of the pixels coupled to the odd scan lines is opposite to the electrical polarity of the pixels coupled to the even scan lines. The display device of claim 6, wherein the first frame time to the fourth frame time respectively have a plurality of odd scan times and a complex even scan time, and the odd number at the first frame time Scanning time and the even scan time, the pixels coupled to the odd scan lines are polarity-switched, and the odd scan time of the second frame time is compared with the even scan time, and the pixels of the even scan line are coupled Polarity conversion. The display device of claim 7, wherein the odd scan time is substantially equal to the even scan time. The display device of claim 6, wherein the pixels coupled to the odd scan lines and the pixels coupled to the even scan lines are polarity-switched at different frame times. The display device of claim 6, wherein the scan driving circuit scans each of the odd scan lines and each of the scan lines sequentially from the first frame time to the fourth frame time. Even scan lines, the scan drive circuit scans each odd scan line at a first frame time without scanning each even scan line, and the scan drive circuit scans each even scan line at the second frame time Without scanning each odd scan line. The display device of claim 6, wherein the scan driving circuit scans each of the odd scan lines and each of the scan lines sequentially from the first frame time to the fourth frame time. Even scan lines, the scan driving circuit scans each of the even scan lines at the first frame time without scanning each odd scan line, and the scan drive circuit scans each odd scan line at the second frame time Without scanning each even scan line.