TW201933307A - Display apparatus and gray level compensation method of display panel - Google Patents

Abstract

A display apparatus and a gray level compensation method of a display panel are provided. A timing controller detects positions of pixels on the display panel that have the same polarity in two adjacent frame display periods and compensates gray levels of the pixels having the same polarity in two adjacent frame display periods.

Description

Gray scale compensation method for display device and display panel

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

In response to the requirements of high speed, high efficiency, light weight and shortness of modern products, all electronic components are actively developing towards miniaturization. A variety of 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 the image display panel of the portable electronic device, in order to meet the demand for miniaturization of the product, the liquid crystal display panel having excellent space utilization efficiency, high image quality, low power consumption, and no radiation is widely known. use.

The direction of rotation of the liquid crystal is related to the electric field supplied to the liquid crystal. In order to eliminate the DC residual voltage stored in the liquid crystal and to avoid polarization of the liquid crystal, the liquid crystal can be driven in a polarity inversion manner, that is, different polarities (for example, positive polarity and negative polarity). The drive voltage is alternately supplied to the pixels in different frames. The polarity inversion driving methods are, for example, the following: column inversion, row inversion, frame inversion, and dot inversion.

In some application situations (for example, when testing a display device), the display device needs to switch the driving mode of polarity inversion. Since the different polarity inversion driving modes correspond to different pixel polarity distributions, the driving method of switching the polarity inversion may occur in the case where the same pixel has the same polarity in the adjacent frame, wherein the adjacent frame is in the adjacent frame. The pixels with the same polarity will instantly show a brightly distributed bright band on the display panel, resulting in a flickering situation in which the brightness of the picture is unevenly distributed.

The present invention provides a display device and a driving method of the display panel, which can effectively prevent the display device from appearing in a flickering situation when switching the polarity inversion driving mode.

The display device of the present invention includes a display panel and a timing controller. The timing controller detects the positions of the pixels having the same polarity during the display of the adjacent two pictures on the display panel, and performs gray scale compensation on the pixels having the same polarity during the display of the adjacent two pictures.

In an embodiment of the invention, the timing controller further detects a change mode of the polarity inversion driving mode of the display panel, and determines the adjacent two according to the lookup table corresponding to the change mode of the polarity inversion driving mode. The position of the pixels with the same polarity during the screen display.

In an embodiment of the invention, wherein the timing controller reduces the grayscale luminance of pixels having the same polarity during display of adjacent two screens during the second of the adjacent two screen display periods.

In an embodiment of the invention, the timing controller further stores a plurality of preset grayscale compensation values corresponding to the plurality of data grayscale values, and the timing controller further selects the corresponding grayscale value according to the pixel of the driven pixel. The preset grayscale compensation value is grayscale compensated.

In an embodiment of the invention, the timing controller performs an interpolation operation according to the data grayscale value of the pixel driven by the timing controller to obtain a grayscale value of the grayscale value of the data corresponding to the pixel driven by the timing controller. The compensation value is used to perform gray scale compensation according to the calculated gray scale compensation value.

The present invention also provides a gray scale compensation method for a display panel comprising the following steps. Detects the position of pixels on the display panel that have the same polarity during the display of two adjacent screens. Gray scale compensation is performed on pixels having the same polarity during display of two adjacent pictures.

In an embodiment of the invention, the gray scale compensation method of the display panel described above includes the following steps. Detects how the polarity inversion drive mode of the display panel changes. The position of the pixel having the same polarity during the display of the adjacent two screens is determined by the lookup table corresponding to the change mode of the polarity inversion driving method.

In an embodiment of the invention, the gray scale compensation method of the display panel includes reducing pixels having the same polarity during display of two adjacent screens during the second of the two adjacent screen display periods. Grayscale brightness.

In an embodiment of the present invention, the grayscale compensation method of the display panel includes: selecting a corresponding preset grayscale compensation value from a plurality of preset grayscale compensation values according to a data grayscale value of the driven pixel. Perform grayscale compensation.

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

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

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 according to an embodiment of the invention, please refer to FIG. The display device includes a display panel 120 and a display driver, which 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 respectively provide driving signals to the display panel 120 to drive the display panel 120 by driving signals. The upper scan line (not labeled) and the data line (not labeled) 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 embodiment of the polarity of a pixel corresponding to a scan line of the display panel 120 when driven in an adjacent frame. Please refer to FIG. 1 and FIG. 2 simultaneously. In FIG. 2, the plurality of pixels P1 corresponding to the scan lines (not labeled) respectively include sub-pixels P1R, P1G, and P1B that display red, green, and blue, respectively, but the invention is not limited thereto, such as As shown in FIG. 2, the sub-pixels on the scanning line (not shown) are alternately arranged in the order in which the scanning lines extend in the order of P1R, P1G, and P1B. In this embodiment, the pixel P1 on the scan line (not shown) of the N+1th frame is driven in a driving manner of 1V inversion, and in the N+2th frame, it is 1V+reverse. The drive mode of the drive is driven, where N is 0 or a positive integer. The driving mode of 1V inversion is such that adjacent pixels on the scan line (not labeled) have opposite polarities, and the driving mode of 1V+ inversion is to divide the pixel P1 on the scan line (not labeled) into multiple Display segments, wherein each display segment includes 16 pixels P1 (for example: 48 sub-pixels), adjacent pixels in different display segments have different polarities, and adjacent sub-pixels have different In addition, the pixels at the junction of two adjacent display segments have the same polarity.

As shown in FIG. 2, since the driving mode of the 1V inversion is simply to make the adjacent pixels P1 on the scanning line (not shown) have opposite polarities, the driving mode of 1V+ inversion is to make the pixel P1 on the scanning line. The polarity distribution pattern is changed every 16 pixels P1 (for example, in the N+2th frame, the pixel polarity distribution of the display segment sec1 is opposite to the pixel polarity distribution of the display segment sec2, and the display segment sec2 is displayed. The pixel polarity distribution is opposite to the pixel polarity distribution of the display segment sec3, and the pixel polarity distribution of the display segment sec3 is opposite to the pixel polarity distribution of the display segment sec4), thus the display segment sec2 and the display segment sec4 The pixel P1 will appear in the adjacent frame with the same polarity, which will cause the display segment sec2 and the pixel P1 of the display segment sec4 to exhibit a brightness enhancement effect in the N+2th frame, thereby The display panel 102 causes a vertical distribution of bright bands in the N+2 frames, resulting in a flickering situation in which the brightness of the screen is unevenly distributed.

In order to avoid this, the timing controller 126 can detect the position of the pixel P1 having the same polarity on the display panel 102 during the display of two adjacent pictures, and have the same polarity during the display of the adjacent two pictures. The pixel P1 performs grayscale compensation to reduce the luminance difference exhibited by the pixels P1 having the same polarity during display of two adjacent pictures during display of two adjacent two pictures. For example, the timing controller 126 can detect the change mode of the polarity inversion driving mode of the display panel 102, and determine the position of the pixel P1 having the same polarity during the display of the adjacent two screens according to the changing manner of the polarity inversion driving mode, and The grayscale luminance of the pixels P1 having the same polarity during the display of the adjacent two screens is reduced during the second of the adjacent two screen display periods. The timing controller 126 can store, for example, a lookup table, and the lookup table can include location information of the pixels P1 having the same polarity during the display of the adjacent two screens corresponding to the manner of changing the polarity inversion driving manner. When the timing controller 126 detects that the polarity inversion driving mode of the display panel 102 is changed, the lookup table corresponding to the changing manner of the polarity inversion driving mode determines that the adjacent two screens have the same polarity during display. The position of the pixel P1.

For example, in the embodiment of FIG. 2, when the timing controller 126 detects that the display panel 102 is switched from the 1V inversion driving mode to the 1V+inversion driving mode, the timing controller 126 can be driven according to the polarity inversion driving mode. The lookup table corresponding to the change mode determines the position of the pixel P1 having the same polarity in the adjacent two frames. After determining that the position of the pixel P1 having the same polarity falls within the display segment sec2 and the display segment sec4, the timing controller 126 may decrease the display segment sec2 and the display segment in the N+2th frame. The gray scale brightness of the pixel P1 of sec4 is used to improve the blinking situation in which the display panel 102 has a vertical distribution of bright bands in the N+2 frames, resulting in uneven distribution of picture brightness.

In some embodiments, the timing controller 126 may also store a plurality of preset grayscale compensation values corresponding to the plurality of data grayscale values. When the grayscale compensation is performed on the pixels P1, the timing controller 126 may be driven according to the same. The grayscale value of the data of the pixel P1 is selected to correspond to the preset grayscale compensation value for grayscale compensation. Since the number of preset grayscale compensation values stored by the timing controller 126 may not correspond to all the grayscale values, in some embodiments, if the grayscale value of the data of the pixels driven by the timing controller 126 is not included in When the preset grayscale compensation value is stored by the timing controller 126, the timing controller 126 can perform the internal grayscale value of the pixel P1 driven by the timing controller 126 and the preset grayscale compensation value stored by the timing controller 126. The interpolation operation is performed to obtain a grayscale compensation value corresponding to the grayscale value of the pixel P1 driven by the timing controller 126, and the grayscale compensation is performed according to the calculated grayscale compensation value.

It should be noted that although the above embodiment is described by taking the 1V inversion and the 1V+ inversion polarity inversion driving method as an example, the present disclosure is not limited to the polarity inversion driving method which can be applied only to 1V and 1V+, and other differences. A polarity inversion driving method of the type (for example, a polarity inversion driving method of 2V+1 inversion) can also be applied to the disclosure, wherein the driving mode of 2V+1 inversion is to divide the pixel P1 on the scanning line into a plurality of displays. A segment, wherein each display segment includes two sub-pixels of opposite polarities, and the sub-pixels at the junction of two adjacent display segments have the same polarity.

3 is a flow chart of a gray scale compensation method for a display panel according to an embodiment of the invention. Please refer to FIG. 3 . It can be seen from the above embodiments that the gray scale compensation method of the display panel may include the following steps. First, detecting the position of the pixel P1 having the same polarity during the display of two adjacent screens on the display panel (step S302), for example, detecting the change manner of the polarity inversion driving mode of the display panel (for example, by 1V) The inverted polarity inversion driving mode is changed to the 1V+inversion polarity inversion driving method), and the drawing having the same polarity during the display of the adjacent two screens is searched according to the lookup table corresponding to the polarity inversion driving method. The location of the prime P1. Next, gray scale compensation is performed on the pixels P1 having the same polarity during the display of the adjacent two screens (step S304) to reduce the pixels P1 having the same polarity during the display of the adjacent two screens in two adjacent two The brightness difference presented during the display of the screen. For example, the grayscale luminance of the pixels P1 having the same polarity during the display of the adjacent two screens can be reduced during the second of the adjacent two screen display periods to reduce the same during the display of the adjacent two screens. The polar pixel P1 exhibits a difference in luminance during display of two adjacent two pictures. In some embodiments, when the gray scale compensation is performed on the pixel, the grayscale compensation may be performed according to the grayscale value of the data of the driven pixel, or the grayscale compensation may be performed according to the driven pixel P1. The grayscale value of the data and the preset grayscale compensation value are interpolated to obtain a grayscale compensation value corresponding to the grayscale value of the driven pixel P1, and then the grayscale compensation value may be performed according to the calculated grayscale compensation value. make up.

In summary, the timing controller of the embodiment of the present invention can detect the positions of pixels having the same polarity during display of two adjacent screens on the display panel, and have the same polarity during display of two adjacent screens. The pixel performs gray scale compensation to avoid a bright band of vertical distribution when the display device switches the polarity inversion driving mode, thereby causing a flickering situation in which the brightness of the screen is unevenly distributed.

120‧‧‧ display panel

122‧‧‧gate driver

124‧‧‧Source Driver

126‧‧‧Sequence controller

P1‧‧‧ pixels

P1R, P1G, P1B‧‧‧ sub-pixels

Sec1~sec4‧‧‧display section

N+1, N+2‧‧‧N+1 frames, N+2 frames

Steps of S302, S304‧‧‧ Grayscale Compensation Method

1 is a schematic diagram of a display device in accordance with an embodiment of the present invention. 2 is a schematic diagram showing the polarity of a pixel corresponding to a scan line on a display panel when it is driven in an adjacent frame. 3 is a flow chart of a method of displaying a panel in accordance with an embodiment of the present invention.

Claims (10)

A display device includes: a display panel; and a timing controller that detects a position of a pixel having the same polarity during display of two adjacent screens on the display panel, and displays during the adjacent two screens Gray scale compensation is performed on pixels having the same polarity. The display device according to claim 1, wherein the timing controller further detects a change manner of the polarity inversion driving mode of the display panel, and according to the lookup table corresponding to the changing manner of the polarity inversion driving mode The position of the pixel having the same polarity during the display of the adjacent two screens is judged. The display device of claim 1, wherein the timing controller reduces pixels having the same polarity during display of the adjacent two screens during the second of the adjacent two screen display periods Grayscale brightness. The display device of claim 1, wherein the timing controller further stores a plurality of preset grayscale compensation values corresponding to the plurality of data grayscale values, the timing controller is further based on the pixels it drives Grayscale compensation is performed by selecting a corresponding grayscale compensation value corresponding to the grayscale value of the data. The display device of claim 4, wherein the timing controller performs an interpolation operation according to a data grayscale value of the pixel that is driven to obtain a data corresponding to a pixel driven by the timing controller. Gray scale compensation value of gray scale value, and gray scale compensation according to the calculated gray scale compensation value. A grayscale compensation method for a display panel, comprising: detecting a position of a pixel having the same polarity during display of two adjacent screens on the display panel; and painting having the same polarity during display of the adjacent two images The gray scale compensation is performed. The gray scale compensation method of the display panel according to claim 6 , comprising: detecting a change manner of a polarity inversion driving manner of the display panel; and searching according to the changing manner of the polarity inversion driving manner The table judges the positions of pixels having the same polarity during the display of the adjacent two pictures. The grayscale compensation method of the display panel of claim 6, comprising: reducing the same polarity during display of the adjacent two screens during the second of the adjacent two screen display periods Gray scale brightness of pixels. The gray scale compensation method of the display panel according to claim 6 , comprising: selecting a corresponding preset gray scale compensation value from a plurality of preset gray scale compensation values according to the gray scale value of the driven pixel Perform grayscale compensation. The gray scale compensation method of the display panel according to claim 9, comprising: performing an interpolation operation according to the data grayscale value of the driven pixel and the preset grayscale compensation values to obtain a corresponding driving The gray scale compensation value of the gray scale value of the data of the pixel; and the gray scale compensation according to the calculated gray scale compensation value.