TWI655868B - Display device - Google Patents

Abstract

A display device includes a display panel and a timing controller. During the first sub-period of the first display period, the display device updates the picture of the first display area in the display panel according to the first polarity control signal. During the second sub-period of the first display period, the display device stops updating the screen of the second display area in the display panel in response to the abnormal event. The timing controller divides the second display period into a third sub-period and a fourth sub-period according to a time ratio. During the third sub-time, the display device updates the screen of the first display area according to the second polarity control signal or stops updating the picture of the first display area. During the fourth sub-time, the display device updates the picture of the second display area according to the first polarity control signal.

Description

Display device

The present invention relates to a display device, and more particularly to a display device including a timing controller.

For liquid crystal displays (LCDs), the electrostatic discharge (ESD) phenomenon in the natural environment often interferes with the timing controller in the liquid crystal display. For example, when an ESD event occurs, the timing controller will output abnormal image data, which may cause an abnormality in the image screen of the liquid crystal display. In order to avoid the above, the existing liquid crystal display does not update the display panel based on abnormal image data. However, the conventional liquid crystal display does not take into consideration the polarity of the driving voltage of the display panel in response to abnormal image data, and thus the brightness of a part of the display area of the display panel changes instantaneously and flicker occurs.

The invention provides a display device which can avoid abnormality of an image screen and can avoid occurrence of flickering.

A display device of the present invention includes a display panel and a timing controller. During the first sub-period of the first display period, the display device updates the picture of the first display area in the display panel according to the first polarity control signal. During the second sub-period of the first display period, the display device stops updating the screen of the second display area in the display panel in response to the abnormal event. The timing controller calculates the time ratio according to the first sub-period and the second sub-period, and divides the second display period after the first display period into the third sub-period and the fourth sub-period according to the time ratio. During the third sub-time, the display device updates the screen of the first display area according to the second polarity control signal or stops updating the picture of the first display area. During the fourth sub-time, the display device updates the picture of the second display area according to the first polarity control signal.

Based on the above, the display device of the present invention can update the screen of the first display area in the display panel according to the first polarity control signal during the first display period, and can stop updating the screen of the second display area in the display panel in response to the abnormal event. During the second display period, the display device may update the screen of the first display area according to the second polarity control signal or stop updating the screen of the first display area, and may update the screen of the second display area by using the first polarity control signal. Thereby, it is possible to avoid an abnormality in the image screen of the display device and to prevent the occurrence of flicker.

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

1 is a schematic diagram of a display device in accordance with an embodiment of the present invention. As shown in FIG. 1 , the display device 100 includes a display panel 110 , a timing controller 120 , a gate driver 130 , and a source driver 140 . The display device 100 can be, for example, a liquid crystal display (LCD). In addition, the gate driver 130 is electrically connected to the display panel 110 and the timing controller 120 , and the source driver 140 is electrically connected to the display panel 110 and the timing controller 120 .

The timing controller 120 includes a receiver 121, and the receiver 121 can generate the image data D and the data enable signal DE in response to data and commands from a graphics processing unit (GPU). The timing controller 120 can output the image data D to the source driver 140 according to the data enable signal DE. Furthermore, the timing controller 120 can generate a control signal of the gate driver 130 (for example, the output enable signal OE) and a control signal of the source driver 140 (for example, the polarity control signal POL). Thereby, under the driving of the gate driver 130 and the source driver 140, the display panel will generate a corresponding image frame.

The timing controller 120 further includes a detector 122, and the detector 122 can be disposed inside or outside the receiver 121. The detector 122 can detect whether an abnormal event occurs, and the abnormal event can be, for example, an electrostatic discharge (ESD) event. For example, the detector 122 can detect whether the data format of the image data D is correct. When an error occurs in the data format of the image data D, the detector 122 may determine that the timing controller 120 has an abnormal event.

It is worth mentioning that, when an abnormal event occurs, the display device 100 can stop updating the display screen of the display panel 110 in response to the abnormal image data, and can adjust the polarity reversal mode of the driving voltage of the display panel 110 according to the abnormal event. . In this way, in addition to avoiding an abnormality in the image screen of the display panel 110, the phenomenon that the display panel 110 flickers can be avoided.

For example, FIG. 2 is a timing diagram illustrating signal timing of a display device according to an embodiment of the invention. Referring to FIG. 1 and FIG. 2 simultaneously, the timing controller 120 can output the image data D0~D3 to the source driver 140 according to the data enable signals DE0~DE3. The polarity control signal POL of the display device 100 includes a first polarity control signal -POL and a second polarity control signal +POL. The source driver 140 generates a driving voltage having a negative polarity according to the first polarity control signal -POL, and generates a driving voltage having a positive polarity according to the second polarity control signal +POL.

The display device 100 can drive the display panel 110 by means of frame inversion, and the image frame F generated by the display panel 110 includes the image frames F0 to F3. Specifically, in the initial display period T0, the source driver 140 can generate a corresponding driving voltage according to the second polarity control signal +POL and the image data D0. The gate driver 130 can sequentially output the scan signals to the display panel 110 to sequentially turn on the pixels in the display panel 110. Thereby, the display device 100 can update the screen of each display area in the display panel 110 according to the second polarity control signal +POL, for example, the screens of the first display area 111 and the second display area 112, thereby causing the display panel 110 to be caused. The image screen F0 is generated.

During the subsequent display period, if the detector 122 does not detect an abnormal event, the display device 100 will successively update the screen of each display area of the display panel 110 according to the first polarity control signal-POL. On the other hand, in the subsequent display period, if the detector 122 detects an abnormal event, the display device 100 will update only a part of the screen of the display panel 110, thereby preventing the image screen of the display panel 110 from being abnormal.

For example, in the first sub-period TB1 of the first display period T1, the detector 122 does not detect an abnormal event. At this time, the display device 100 can update the screen of the first display area 111 in the display panel 110 according to the first polarity control signal -POL and the first data D11 in the image data D1. During the second sub-period TB2 of the first display period T1, the detector 122 detects an abnormal event. At this time, the data enable signal DE1 in the second sub-period TB2 will be interfered, thereby causing an abnormality in the second data D12 in the image data D1. In order to avoid an abnormality in the image picture F1 of the display panel 110, the timing controller 120 transmits the output enable signal OE to the gate driver 130 during the second sub-period TB2. Thereby, the gate driver 130 will not output the scan signal to the second display area 112 in response to the output enable signal OE. Therefore, in the second sub-period TB2, the display device 100 will stop updating the screen of the second display area 112.

In other words, in the initial display period T0, the display device 100 updates the screens of the first display area 111 and the second display area 112 according to the second polarity control signal +POL based on the manner of screen inversion. During the first display period T1, the display device 100 updates the screen of the first display area 111 according to the first polarity control signal -POL in response to an abnormal event (eg, an electrostatic discharge event), and does not update the screen of the second display area 112. That is, in the first display period T1, the pixels in the first display region 111 have a driving voltage of a negative polarity, and the pixels in the second display region 112 are maintained at a driving voltage of a positive polarity.

It should be noted that, in order to avoid the phenomenon that the image of the display panel 110 (for example, the image screen F2) flickers, the display device 100 drives the first display region 111 with driving voltages of different polarities in subsequent display periods. The second display area 112.

Specifically, the timing controller 120 may calculate a time ratio according to the first sub-period TB1 and the second sub-period TB2. Further, the timing controller 120 may divide the second display period T2 after the first display period T1 into the third sub-period TB3 and the fourth sub-period TB4 according to the time ratio. For example, the timing controller 120 may calculate the time ratio according to the ratio of the first sub-period TB1 to the second sub-period TB2, and the time ratio in FIG. 2 may be, for example, 1:1. In contrast, the ratio of the third sub-period TB3 and the fourth sub-period TB4 divided by the timing controller 120 may be, for example, 1:1.

In the third sub-period TB3, the source driver 140 can generate a corresponding driving voltage according to the second polarity control signal +POL and the image data D2, and the gate driver 130 can sequentially output the scanning signal to the first display area 111. Thereby, the display device 100 can update the screen of the first display area 111 according to the second polarity control signal +POL. In addition, in the fourth sub-period TB4, the source driver 140 can generate a corresponding driving voltage according to the first polarity control signal-POL and the image data D2, and the gate driver 130 can sequentially output the scanning signal to the second display area 112. Thereby, the display device 100 can update the screen of the second display area 112 according to the first polarity control signal -POL. Further, the display panel 110 may generate the image frame F2 during the second display period T2.

By analogy, the timing controller 120 can further divide the third display period T3 after the second display period T2 into the fifth sub-period TB5 and the sixth sub-period TB6 according to the time ratio. During the fifth sub-period TB5, the display device 100 can update the picture of the first display area 111 according to the image data D3 and the first polarity control signal -POL. During the sixth sub-period TB6, the display device 100 can update the screen of the second display area 112 according to the image data D3 and the second polarity control signal +POL. Thereby, the display panel 110 will generate the image frame F3 in the third display period T3.

In other words, in the embodiment of FIG. 2, the timing controller 120 transmits the output enable signal OE to the gate driver 130 during the second sub-period TB2. In addition, the timing controller 120 transmits the first polarity control signal -POL to the source driver 140 in the first sub-period TB1, the fourth sub-period TB4 and the fifth sub-period TB5, respectively, and the timing controller 120 is in the second sub-period The period TB2, the third sub-period TB3 and the sixth sub-period TB6 respectively transmit the second polarity control signal +POL to the source driver 140. Thereby, as indicated by the arrow symbol 210, the display device 100 can update the screen of the second display area 112 according to the first polarity control signal -POL in the fourth sub-period TB4 in response to the abnormal event in the second sub-period TB2. Thereby, the display device 100 can alternately drive the second display region 112 with driving voltages of different polarities. Thereby, it is possible to avoid the occurrence of flickering of the image frames F0 to F3 of the display panel 110.

It should be noted that, in the case where no abnormal event occurs, the first display area 111 and the second display area 112 may have the same polarity driving in each display period in response to the screen inversion mode adopted by the display apparatus 100. Voltage. When an abnormal event occurs, the display device 100 updates only the screen of the first display area 111 in response to the abnormal event, thereby causing the first display area 111 and the second display area 112 to have driving voltages of different polarities. Therefore, in the embodiment of FIG. 2, after the abnormal event occurs, the display device 100 updates the first display area 111 and the second display area 112 by using driving voltages of different polarities respectively to prevent the display panel 110 from flickering. .

In another embodiment, after the abnormal event occurs, and after only updating the screen of the first display area 111, the display apparatus 100 may not update the screen of the first display area 111, but only update the second display area. 112 screen. In other words, the display device 100 can alternately update the screen of the first display area 111 and the screen of the second display area 112 during the two display periods, thereby causing the first display area 111 and the second display area 112 to be sequentially updated to the same polarity. Drive voltage. Thereafter, the display device 100 can drive the display panel 110 again by means of screen inversion.

For example, FIG. 3 is a timing diagram for explaining signal timing of a display device according to another embodiment of the present invention. As shown in FIG. 3, the timing controller 120 transmits the output enable signal OE to the gate driver 130 during the second sub-period TB2 and the third sub-period TB3. In addition, the timing controller 120 transmits the first polarity control signal -POL to the source driver 140 in the first display period T1 and the second display period T2, respectively, and the timing controller 120 transmits the second polarity in the third display period T3. Control signal +POL to source driver 140.

Therefore, as shown by the arrow symbol 310, in the first display period T1, the display device 100 can update the screen of the first display area 111 according to the first polarity control signal-POL and the image data D1, and the display device 100 can respond to the first The abnormal event detected by the TB2 during the two sub-times does not update the screen of the second display area 112. During the second display period T2, the display device 100 stops updating the screen of the first display area 111 during the third sub-period TB3, and updates the second display according to the first polarity control signal-POL and the image data D2 during the fourth sub-period TB4. Area 112. During the third display period T3, the display device 100 updates the screens of the first display area 111 and the second display area 112 according to the second polarity control signal +POL and the image data D3.

In other words, in the embodiment of FIG. 3, during the first display period T1 and the second display period T2, the display device 100 sequentially updates the screen of the first display area 111 and the second display area according to the first polarity control signal -POL. The screen of 112 and the screen of the second display area 112 and the screen of the first display area 111 are not sequentially updated. Thereby, the first display area 111 and the second display area 112 will have driving voltages of the same polarity. Thereafter, the display device 100 drives the display panel 110 in such a manner that the screen can be reversed again. For example, during the third display period T3, the display device 100 may update the screens of the first display area 111 and the second display area 112 according to the same second polarity control signal +POL. In other words, the display device 100 can alternately drive the pixels in the first display region 111 and the second display region 112 by using driving voltages of different polarities, thereby avoiding the phenomenon that the image frames F0 to F3 of the display panel 110 are flickered.

In summary, the display device of the present invention can update the screen of the first display area in the display panel according to the first polarity control signal during the first display period, and can stop updating the second display area in the display panel according to the abnormal event. Picture. In addition, during the second display period, the display device may update the screen of the first display area according to the second polarity control signal or stop updating the screen of the first display area, and may update the screen of the second display area by using the first polarity control signal. . Thereby, it is possible to avoid an abnormality in the image screen of the display device, and the display device can alternately drive the display region in the display panel by using driving voltages of different polarities, thereby preventing occurrence of flicker.

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.

100‧‧‧ display device

110‧‧‧ display panel

111‧‧‧First display area

112‧‧‧Second display area

120‧‧‧Timing controller

121‧‧‧ Receiver

122‧‧‧Detector

130‧‧‧gate driver

140‧‧‧Source Driver

D, D0~D3‧‧‧ image data

D11‧‧‧First Information

D12‧‧‧Second information

DE, DE0~DE3‧‧‧ data enable signal

OE‧‧‧ output enable signal

POL‧‧‧polar control signal

-POL‧‧‧First polarity control signal

+POL‧‧‧second polarity control signal

T0‧‧‧ initial display period

T1~T3‧‧‧First to third display period

TB1~TB6‧‧‧first to sixth sub-period

F, F0~F3‧‧‧ image screen

210, 310‧‧‧ arrow symbol

1 is a schematic diagram of a display device in accordance with an embodiment of the present invention. 2 is a timing diagram for explaining signal timing of a display device according to an embodiment of the invention. FIG. 3 is a timing diagram for explaining signal timing of a display device according to another embodiment of the present invention.

Claims (10)

A display device includes: a display panel, wherein during a first sub-period of a first display period, the display device updates a screen of a first display area of the display panel according to a first polarity control signal, and During a second sub-period of the first display period, the display device stops updating the screen of a second display area in the display panel in response to an abnormal event; and a timing controller according to the first sub-period and the first Calculating a time ratio during the second sub-period, and dividing a second display period after the first display period into a third sub-period and a fourth sub-period according to the time ratio, wherein during the third sub-period, The display device updates the screen of the first display area or stops updating the screen of the first display area according to a second polarity control signal, and during the fourth sub-time, the display device updates the first according to the first polarity control signal The screen of the second display area. The display device of claim 1, further comprising: a gate driver electrically connected to the display panel and the timing controller; and a source driver electrically connected to the display panel and the timing controller And generating a corresponding driving voltage according to the first polarity control signal or the first polarity control signal. The display device of claim 1, wherein the timing controller comprises: a detector for detecting the abnormal event. The display device of claim 1, wherein the display device updates the first display area and the second display area according to the second polarity control signal during an initial display period before the first display period Picture. The display device of claim 1, wherein: the timing controller further divides a third display period after the second display period into a fifth sub-period and a sixth sub-period according to the time ratio. During the third sub-period and the fifth sub-period, the display device sequentially updates the screen of the first display area according to the second polarity control signal and the first polarity control signal, during the fourth sub-period During the sixth sub-segment, the display device sequentially updates the screen of the second display area according to the first polarity control signal and the second polarity control signal. The display device of claim 5, wherein: during the first sub-period, the fourth sub-period, and the fifth sub-period, the timing controller respectively transmits the first polarity control signal to a source The driver, during the second sub-period, the third sub-period and the sixth sub-period, the timing controller respectively transmits the second polarity control signal to the source driver. The display device of claim 5, wherein during the second sub-time, the timing controller transmits an output enable signal to a gate driver to cause the display device to stop updating the second display area. Picture. The display device of claim 1, wherein the timing controller transmits an output enable signal to a gate driver during the second sub-period and the third sub-period, so that the display device is The second sub-period stops updating the screen of the second display area, and stops updating the screen of the first display area during the third sub-period. The display device of claim 8, wherein the display device updates the first display area and the second display area according to the second polarity control signal during a third display period after the second display period Picture. The display device of claim 9, wherein the timing controller transmits the first polarity control signal to a source driver respectively during the first display period and the second display period, and in the third During the display, the timing controller transmits the second polarity control signal to the source driver.