TWI662524B - Display apparatus and gray level compensation method of display panel - Google Patents

Abstract

A grayscale compensation method for a display device and a display panel. The timing controller detects the positions of pixels on the display panel that have the same polarity during the display of two adjacent screens, and performs grayscale compensation on pixels that have the same polarity during the display of two adjacent screens.

Description

Gray scale compensation method for display device and display panel

The present invention relates to an electronic device, and more particularly, to a grayscale compensation method for a display device and a display panel.

In order to meet the requirements of modern products for high speed, high efficiency, and lightness and shortness, each electronic component is actively developing towards miniaturization. Various portable electronic devices have also become mainstream, such as: Note Book, Cell Phone, Electronic Dictionary, Personal Digital Assistant (P), Web Pad, and Tablet PC, etc. For image display panels of portable electronic devices, in order to meet the needs of product miniaturization, liquid crystal display panels with excellent space utilization efficiency, high picture quality, low power consumption, and no radiation have been widely used. use.

The rotation direction of the liquid crystal is related to the electric field provided to the liquid crystal. In order to eliminate the DC residual voltage stored in the liquid crystal and avoid the polarization of the liquid crystal, the liquid crystal can be driven in a polarity inversion manner, that is, different polarities (such as positive polarity and negative polarity) The driving voltage will be alternately provided to the pixels in different frames. Example of driving method with polarity inversion Such as the following: column inversion, column inversion, frame inversion, and dot inversion.

In some applications (for example, when testing a display device), the display device needs to switch the driving mode of the polarity inversion. Because different polarity inversion driving methods correspond to different pixel polarity distributions, switching the driving method of polarity inversion may cause the same pixel to have the same polarity in adjacent frames, and in adjacent frames Pixels with the same polarity in the display panel will instantaneously display brightly distributed bright bands on the display panel, resulting in a flickering situation in which the brightness distribution of the screen is uneven.

The invention provides a display device and a driving method of a display panel, which can effectively avoid screen flicker when the display device switches a driving mode with a reversed polarity.

The display device of the present invention includes a display panel and a timing controller. The timing controller detects the positions of pixels on the display panel that have the same polarity during the display of two adjacent screens, and performs grayscale compensation on pixels that have the same polarity during the display of two adjacent screens.

In an embodiment of the present invention, the timing controller further detects a change mode of the polarity inversion driving mode of the display panel, and judges whether the two are adjacent to each other according to a lookup table corresponding to the change of the polarity inversion driving mode. Position of pixels with the same polarity during screen display.

In an embodiment of the present invention, the timing controller is The second frame period of the surface display period reduces the grayscale brightness of pixels having the same polarity during the display period of two adjacent frames.

In an embodiment of the present invention, the timing controller further stores a plurality of preset grayscale compensation values corresponding to a plurality of data grayscale values, and the timing controller further selects a correspondence according to the data grayscale values of the pixels it drives. The preset grayscale compensation value is used for grayscale compensation.

In an embodiment of the present invention, the timing controller further performs an interpolation operation based on the data grayscale values of the pixels driven by the timing controller to obtain the grayscale corresponding to the data grayscale values of the pixels driven by the timing controller. Compensation value, and perform grayscale compensation according to the calculated grayscale compensation value.

The invention also provides a method for compensating the grayscale of a display panel, which includes the following steps. Detect the positions of pixels on the display panel that have the same polarity during the display of two adjacent frames. Pixels having the same polarity during the display of two adjacent pictures are subjected to grayscale compensation.

In an embodiment of the present invention, the above-mentioned grayscale compensation method for a display panel includes the following steps. Detects the change of the polarity inversion driving mode of the display panel. The positions of pixels having the same polarity during the display of two adjacent screens are determined according to a lookup table corresponding to the change of the polarity inversion driving method.

In an embodiment of the present invention, the above-mentioned grayscale compensation method for a display panel includes reducing pixels having the same polarity during the display period of two adjacent frames during a second frame period of two adjacent frame display periods. Grayscale brightness.

In an embodiment of the present invention, the gray-scale compensation method of the display panel is as described above. The method includes selecting a corresponding preset grayscale compensation value from a plurality of preset grayscale compensation values to perform grayscale compensation according to the data grayscale values of the driven pixels.

In an embodiment of the present invention, the above-mentioned grayscale compensation method for a display panel includes the following steps. An interpolation operation is performed according to the data grayscale value of the driven pixel and a preset grayscale compensation value to obtain a grayscale compensation value corresponding to the data grayscale value of the driven pixel. The grayscale compensation is performed according to the calculated grayscale compensation value.

Based on the above, the timing controller of the embodiment of the present invention detects the positions of pixels on the display panel that have the same polarity during the display of two adjacent screens, and performs the processing on pixels that have the same polarity during the display of two adjacent screens. Gray scale compensation to avoid screen flicker when the display device switches the driving mode with reversed polarity.

In order to make the above features and advantages of the present invention more comprehensible, embodiments are hereinafter described in detail with reference to the accompanying drawings.

120‧‧‧Display Panel

122‧‧‧Gate driver

124‧‧‧Source Driver

126‧‧‧Sequence Controller

P1‧‧‧Pixels

P1R, P1G, P1B‧‧‧ subpixels

sec1 ~ sec4‧‧‧Display section

N + 1, N + 2‧‧‧th N + 1th frame, N + 2th frame

Steps of S302, S304‧‧‧‧Grayscale compensation method

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

FIG. 2 is a schematic diagram illustrating the polarity of pixels corresponding to a scanning line on a display panel when driven in an adjacent frame.

FIG. 3 is a flowchart of a method for displaying a panel according to an embodiment of the present invention.

FIG. 1 is a schematic diagram of a display device according to an embodiment of the present invention. Refer to Figure 1. The display device includes a display panel 120 and a display driver. The display driver may include, for example, a gate driver 122, a source driver 124, and a timing controller 126. The display panel 120 has a plurality of pixels (not labeled) arranged in an array. The gate driver 122 and the source driver 124 are coupled to the display panel 120 and provide driving signals to the display panel 120 to drive the display panel 120 by the driving signals. Scan line (unlabeled) and data line (unlabeled) on the display to display the image to be displayed. The timing controller 126 is coupled to the gate driver 122 and the source driver 124 and provides a control signal to cause the gate driver 122 and the source driver 124 to generate a driving signal.

FIG. 2 illustrates an example of the polarity of pixels corresponding to a scanning line on the display panel 120 when driven in an adjacent frame. Please refer to FIG. 1 and FIG. 2 at the same time. In FIG. 2, the multiple pixels P1 corresponding to the scanning lines (not labeled) include, for example, sub-pixels P1R, P1G, and P1B that display red, green, and blue colors, but the present invention is not limited thereto. As shown in FIG. 2, the sub-pixels on the scanning line (not labeled) are alternately arranged along the extending direction of the scanning line in the order of P1R, P1G, and P1B. In this embodiment, the pixel P1 on the scanning line (not labeled) of the (N + 1) th frame is driven in a 1V inversion driving mode, and in the N + 2th frame is driven by 1V + inversion The driving mode of the rotation is driven, where N is 0 or a positive integer. The driving method of 1V inversion is to make adjacent pixels on the scanning line (not labeled) have opposite polarities, and the driving method of 1V + inversion is to separate pixels P1 on the scanning line (not labeled) into multiple Display segments, where each display segment includes 16 pixels P1 (eg, 48 sub-pixels), adjacent pixels in each display segment have different polarities, and adjacent sub-pixels have different In addition, the pixels where two adjacent display sections meet have the same polarity.

As shown in FIG. 2, the driving method of 1V inversion is to simply make adjacent pixels P1 on the scanning line (not labeled) have opposite polarities, and the driving method of 1V + inversion is to make pixel P1 on the scanning line. The polarity distribution is changed every 16 pixels P1 (for example, in the N + 2 frame, the pixel polarity distribution of the display section sec1 is opposite to the pixel polarity distribution of the display section sec2, and the display section sec2 The polarity distribution of pixels is opposite to the polarity distribution of pixels in display section sec3, and the pixel polarity distribution of display section sec3 is opposite to the pixel polarity distribution of display section sec4.) The pixel P1 of will appear in the adjacent frame with the same polarity, so that the pixel P1 of the display section sec2 and the display section sec4 will show the effect of brightness enhancement in the N + 2 frame, and then This causes the display panel 120 to have brightly distributed bright bands in the N + 2th frame, causing a flickering situation in which the brightness distribution of the screen is uneven.

To avoid this, the timing controller 126 can detect the positions of the pixels P1 on the display panel 120 that have the same polarity during the display of two adjacent screens, and The pixel P1 performs gray-scale compensation to reduce the brightness difference between the pixels P1 having the same polarity during the display of two adjacent pictures during the display of two adjacent two pictures. For example, the timing controller 126 may detect the change of the polarity inversion driving method of the display panel 120, and determine the position of the pixel P1 having the same polarity during the display of two adjacent screens according to the change of the polarity inversion driving method, and In the second picture period of the two adjacent picture display periods, the grayscale brightness of the pixels P1 having the same polarity during the two picture display periods are reduced. The timing controller 126 may store a lookup table, for example, and the lookup table may include It includes the position information of the pixels P1 having the same polarity during the display of two adjacent screens corresponding to the change of the polarity inversion driving method. In this way, when the timing controller 126 detects a change in the polarity inversion driving mode of the display panel 120, it can determine, according to the lookup table corresponding to the change in the polarity inversion driving mode, that the two pixels having the same polarity during the display of two adjacent screens The position of pixel P1.

For example, in the embodiment of FIG. 2, when the timing controller 126 detects that the display panel 120 changes from a 1V inversion driving method to a 1V + inversion driving method, the timing controller 126 may invert the driving method according to the polarity. The lookup table corresponding to the method of change determines the position of the pixel P1 with the same polarity in two adjacent picture frames. After judging that the positions of the pixels P1 having the same polarity fall in the display section sec2 and the display section sec4, the timing controller 126 can reduce to fall in the display section sec2 and the display section in the N + 2 frame. The gray level brightness of the pixel P1 of sec4 is to improve the flickering situation that the display panel 120 has a vertically-distributed bright band in the N + 2 frame and causes uneven brightness distribution of the screen.

In some embodiments, the timing controller 126 may also store multiple preset grayscale compensation values corresponding to multiple data grayscale values. When performing grayscale compensation on the pixel P1, the timing controller 126 may Select the corresponding preset grayscale compensation value for the grayscale value of the pixel P1 for grayscale compensation. Since the number of preset grayscale compensation values stored by the timing controller 126 may not correspond to all grayscale values, in some embodiments, if the data grayscale values of the pixels driven by the timing controller 126 are not included in When the preset grayscale compensation value stored in the timing controller 126 is within, the timing controller 126 may use the grayscale value of the pixel P1 driven by it and the data stored in the timing controller 126. The preset grayscale compensation value is interpolated to obtain a grayscale compensation value corresponding to the data grayscale value of the pixel P1 driven by the timing controller 126, and grayscale compensation is performed according to the calculated grayscale compensation value.

It is worth noting that although the above embodiments use the 1V inversion and 1V + inversion polarity inversion driving methods as examples, the disclosure is not limited to the polarity inversion driving methods that can only be applied to 1V and 1V +, and other differences The type of polarity inversion driving method (such as the 2V + 1 inversion polarity inversion driving method) can also be applied to this disclosure. The 2V + 1 inversion driving method is to divide the pixel P1 on the scanning line into multiple displays. Segment, where each display segment includes two sub-pixels of opposite polarity, and the sub-pixels where two adjacent display segments meet have the same polarity.

FIG. 3 is a flowchart of a grayscale compensation method for a display panel according to an embodiment of the present invention. Please refer to FIG. 3. It can be known from the above embodiments that the grayscale compensation method of the display panel may include the following steps. First, the position of the pixel P1 having the same polarity during the display of two adjacent screens on the display panel is detected (step S302). For example, the change of the polarity inversion driving method of the display panel (for example, by 1V) can be detected. Inverted polarity inversion driving method is changed to 1V + inverted polarity inversion driving method), and the lookup table corresponding to the method of changing the polarity inversion driving method is used to find pictures with the same polarity during the display of two adjacent screens. The location of prime P1. Next, grayscale compensation is performed on the pixels P1 having the same polarity during the display of two adjacent screens (step S304), so as to reduce the pixels P1 having the same polarity during the display of two adjacent screens between two adjacent two The difference in brightness presented during each screen display. For example, it can be reduced during the second screen display period of two adjacent screen display periods. The grayscale brightness of the polar pixels P1 is to reduce the brightness difference between pixels P1 having the same polarity during the display of two adjacent pictures during the display of two adjacent two pictures. In some embodiments, when performing grayscale compensation on pixels, the corresponding preset grayscale compensation value may be selected for grayscale compensation according to the grayscale values of the pixels it drives, or according to the driven pixel P1 Interpolation of the data grayscale value and the preset grayscale compensation value to obtain the grayscale compensation value corresponding to the data grayscale value of the driven pixel P1, and then the grayscale can be performed according to the calculated grayscale compensation value make up.

In summary, the timing controller according to the embodiment of the present invention can detect the positions of pixels on the display panel that have the same polarity during the display of two adjacent screens, and Pixels are compensated for gray levels to avoid flickering in which the display device switches the driving mode of the polarity inversion to have a vertically distributed bright band, resulting in uneven brightness distribution of the screen.

Claims (8)

A display device includes: a display panel; and a timing controller that detects the positions of pixels on the display panel that have the same polarity during two adjacent screen display periods, and detects the positions of pixels with the same polarity during the two adjacent screen display periods. Pixels with the same polarity are compensated for gray levels. The timing controller further detects the change of the polarity inversion driving mode of the display panel, and judges the look-up table corresponding to the change of the polarity inversion driving mode. The positions of pixels with the same polarity during the display of two adjacent pictures. The display device according to item 1 of the scope of patent application, wherein the timing controller reduces pixels having the same polarity during the display period of the two adjacent frames during the second frame period of the display period of the two adjacent frames. Grayscale brightness. The display device according to item 1 of the scope of patent application, wherein the timing controller further stores a plurality of preset gray-scale compensation values corresponding to a plurality of data gray-scale values, and the timing controller is further based on the pixels of the pixels it drives. Select the corresponding preset grayscale compensation value for the grayscale value of the data for grayscale compensation. The display device according to item 3 of the scope of patent application, wherein the timing controller further performs interpolation operation based on the data grayscale values of the pixels driven by the timing controller to obtain data corresponding to the pixels driven by the timing controller. The grayscale compensation value of the grayscale value, and the grayscale compensation is performed according to the calculated grayscale compensation value. A gray-scale compensation method for a display panel includes: detecting positions of pixels on the display panel having the same polarity during display of two adjacent screens; and pixels having the same polarity during display of the two adjacent screens Performing grayscale compensation; detecting a change manner of the polarity inversion driving method of the display panel; and judging a lookup table corresponding to the change method of the polarity inversion driving method to determine that the two polarities having the same polarity during the display of the two adjacent screens Pixel position. The gray-scale compensation method for a display panel according to item 5 of the scope of patent application, comprising: reducing a second display period of the two adjacent display periods during which the second display period has the same polarity. Pixel grayscale brightness. The grayscale compensation method for a display panel according to item 5 of the scope of patent application, comprising: selecting a corresponding preset grayscale compensation value from a plurality of preset grayscale compensation values according to the grayscale value of the pixel being driven. Perform grayscale compensation. The grayscale compensation method for a display panel according to item 7 of the scope of patent application, includes: performing an interpolation operation based on the data grayscale values of the driven pixels and the preset grayscale compensation values to obtain the corresponding driven The grayscale compensation value of the grayscale value of the pixel data; and perform grayscale compensation according to the calculated grayscale compensation value.