TW201931349A - Display device and driving method thereof - Google Patents

Abstract

A display device comprises a first pixel, a second pixel, and a data driver. The first pixel correspondingly displays a first group of grayscale data, the second pixel is adjacent to the first pixel and forms a pixel group with the first pixel, and the second pixel corresponds to a second group of grayscale data. The data driver is electrically coupled to the first pixel and the second pixel, and the data driver is configured to determine whether to make the first pixel and the second pixel emit light according to the first group of grayscale data and the second group of grayscale data.

Description

Display device and driving method thereof

The invention relates to a display device, in particular to a display device capable of improving color shift and a driving method thereof.

Currently, display devices are widely used in various fields to display pictures, such as smart phones, tablet computers, or televisions. The display device includes a display panel. The display panel includes a plurality of pixel units. The display device displays a picture on the display panel by driving the plurality of pixel units. However, there are still some shortcomings in the current display devices. For example, the conventional manufacturing process still cannot make the pixel units of the same display panel have the same characteristics. Therefore, the pixel units are arranged in different positions or driven by different chips. There are different driving effects, so the driving current / voltage required for each pixel unit is different. However, the different driving currents / voltages required by the pixel units will cause the brightness unevenness between the pixel units during driving, which will cause the color shift, and the viewer will feel the above in the display screen with low brightness. The regrets.

In order to solve the aforementioned shortcomings, the present invention provides a display device including a first pixel, a second pixel, and a data driver. The first pixel correspondingly displays the first group of grayscale data, the second pixel is adjacent to the first pixel and forms a pixel group with the first pixel, and the second pixel correspondingly displays the second group of grayscale data. The data driver is electrically coupled to the first pixel and the second pixel. The data driver is used to determine whether to make the first pixel and the second pixel emit light according to the first group of grayscale data and the second group of grayscale data.

The invention further provides a driving method for a display device. The display device includes a data driver and a plurality of pixels. The plurality of pixels includes a plurality of first pixels and a plurality of second pixels. The first pixel and the second pixel. Adjacent, the steps include: at the time of displaying the first frame, each first pixel correspondingly displays an individual first group of grayscale data, and each second pixel correspondingly displays an individual second group of grayscale data; and , So that the data driver decides whether to cause the corresponding first pixel and the second pixel to emit light according to the first group of grayscale data and the second group of grayscale data.

In an embodiment, when the first set of grayscale data displayed is less than or equal to the first grayscale threshold, the data driver makes the first pixel not to emit light, and when the second set of grayscale data displayed is less than or equal to the second grayscale threshold Value, the data driver prevents the second pixel from emitting light, and the second grayscale threshold value is greater than the first grayscale threshold value.

Therefore, the present invention sets the first grayscale threshold value and the second grayscale threshold value, and makes the first pixel not to emit light when the first set of grayscale data is less than or equal to the first grayscale threshold value. When the set of grayscale data is less than or equal to the second grayscale threshold, the second pixel is prevented from emitting light, which prevents the pixel from displaying a predetermined brightness, and effectively improves the situation of uneven brightness and color deviation of the pixel.

In order to make the above and other objects, features, and advantages of the present invention more comprehensible, a detailed description is given below with reference to preferred embodiments and the accompanying drawings.

Please refer to FIG. 1. FIG. 1 is a schematic diagram of an embodiment of a display device 100. The display device 100 is, for example, an Active Martix Organic Light Emitting Display (AMOLED). The display device 100 includes a data driver 10, a gate driver 20, and a plurality of pixels 30, and each pixel 30 includes a plurality of sub-pixels 31. In this embodiment, each pixel 30 includes four sub-pixels 31, but is not limited thereto. Each sub-pixel 31 is individually electrically coupled to the data driver 10 through the data line DL and is electrically coupled to the gate driver 20 through the gate line GL. Multiple sub-pixels 31 in the same row and the same one The data lines DL are electrically coupled, and the multiple sub-pixels 31 in the same column are electrically coupled with the same gate line GL. Each sub-pixel 31 is used to receive the gate driving signal transmitted by the gate driver 20 and is enabled by the gate driving signal. The enabled sub-pixel 31 receives the display data transmitted by the data driver 10 and displays the data. For example, the driving current / voltage is described above, and the display data corresponds to a gray scale data, and the gray scale data corresponds to a defined brightness. Therefore, the enabled sub-pixel 31 can emit light according to the corresponding brightness of the gray scale data display.

An example of the arrangement of the pixels 30 will be further described below. Please refer to FIG. 2A. FIG. 2A is a schematic diagram of a pixel 30 arrangement according to a first embodiment of the present invention. In the embodiment of the present invention, the pixel 30 includes four sub-pixels 31, and each sub-pixel 31 corresponds to one of the three primary colors. Therefore, the pixel 30 includes the sub-pixel 31a corresponding to the red primary color R and the green primary color G. Subpixel 31b and subpixel 31c and subpixel 31d corresponding to the blue primary color B. The pixel 30 can be divided into a first pixel 30a and a second pixel 30b. The first pixel 30a is used to correspondingly display the first set of grayscale data in a frame period, and the second pixel is in a frame period. It is used to display a second set of grayscale data correspondingly. The first pixel 30a and the second pixel 30b are adjacent to each other and form a pixel group 30G. As shown in the embodiment of FIG. 2A, the first pixels 30a and the second pixels 30b are adjacent to each other in the first direction X and the second direction Y, and the first pixels 30a are adjacent to each other in the first direction X. The second pixels 30b form a pixel group 30G, where the first direction X and the second direction Y are orthogonal to each other.

Please refer to FIG. 2B, which is a schematic diagram of a second embodiment of the pixel 30 arrangement of the present invention. The difference between FIG. 2B and FIG. 2A is that, in the embodiment of FIG. 2B, in the first direction X and the second direction Y, each pixel group 30G includes one first pixel 30a and two second pixels 30b. And one of the second pixels 30b is disposed between the other of the second pixels 30b and the first pixel 30a. In addition, each first pixel 30a is disposed between two second pixels 30b, and the two second pixels 30b are different pixel groups 30G. As shown in the first column of FIG. 2B, taking a first pixel 30a and two consecutive second pixels 30b located on the right-hand side of the first pixel 30a as a pixel group 30G as an example, in the same pixel group 30G In the second pixel 30b, an adjacent first pixel 30a is arranged on the left side, and another second pixel 30b is arranged on the right side of the second pixel 30b.

Please refer to FIG. 2C, which is a schematic diagram of a third embodiment of the pixel 30 arrangement of the present invention. The difference between FIG. 2C and FIG. 2A is that, in the embodiment of FIG. 2C, in the first direction X and the second direction Y, each pixel group 30G includes two first pixels 30a and one second pixel 30b. . In each pixel group 30G, one of the first pixels 30a is disposed between the other of the first pixels 30a and the second pixels 30b. In addition, each second pixel 30b is disposed between two first pixels 30a, and the two first pixels 30a are different pixel groups 30G. As shown in the first column of FIG. 2C, taking the second pixel 30b and two consecutive first pixels 30a on the left of the second pixel 30b as a pixel group 30G as an example, in the same pixel group 30G An adjacent first pixel 30a is disposed on the left side of the first pixel 30a, and an adjacent second pixel 30b is disposed on the right side of the first pixel 30a.

Please refer to FIG. 2D, which is a schematic diagram of a fourth embodiment of the pixel 30 arrangement of the present invention. The difference between FIG. 2D and FIG. 2A is that, in this embodiment, in the first direction X and the second direction Y, each pixel group 30G includes two first pixels 30a and two second pixels 30b. Two first pixels 30a are adjacent to each other, two second pixels 30b are adjacent to each other, and one of the first pixels 30a and one of the second pixels 30b of the pixel group 30G are adjacent to each other. And taking a single first pixel 30a or two second pixels 30b as examples, in the first direction X and the second direction Y, the first pixel 30a is arranged in the other first pixel 30a and the second pixel Between 30b, the second pixel 30a is disposed between the first pixel 30a and another second pixel 30b.

Therefore, in conjunction with the pixel 30 arrangement embodiment of FIG. 2A to FIG. 2D, the data driver 10 of the present invention is configured to according to the first group of grayscale data, the second group of grayscale data, the first grayscale threshold value, and the second grayscale The threshold value determines whether the first pixel 30a and the second pixel 30b are caused to emit light, and the second grayscale threshold value is not larger than the first grayscale threshold value. Further, in the current display frame, when the first set of grayscale data to be displayed is less than or equal to the first grayscale threshold, the data driver 10 makes the first pixel 30a not to emit light, and when the second grayscale is displayed, The data is less than or equal to the second gray-scale threshold, and the data driver 10 prevents the second pixel 30b from emitting light. The non-light emission is, for example, that the data driver 10 transmits a non-light emission signal to the first pixel 30a or the second pixel 30b which is electrically coupled. That is, when the grayscale values of the first group of grayscale data and the second group of grayscale data are greater than the second grayscale threshold, the first pixel 30a and the second pixel 30b emit light normally; The grayscale data of the grayscale data and the second set of grayscale data are both smaller than the second grayscale threshold value and larger than the first grayscale threshold value. The first pixel 30a normally emits light, and the second pixel 30b does not emit light. The grayscale data and the grayscale values of the second set of grayscale data are both smaller than the first grayscale threshold, and the first pixel 30a and the second pixel 30b do not emit light.

In an embodiment, the range of the second grayscale threshold may be, for example, between 10 and 20 grayscales, and the range of the first grayscale threshold may be, for example, between 5 and 10 grayscales. For example, the first grayscale threshold may be 5 grayscales, and the second grayscale threshold may be 10 grayscales. In other embodiments, the first grayscale threshold may be 7 grayscales, and the second grayscale threshold may be 15 grayscales. In another embodiment, the first grayscale threshold value may be 10 grayscale levels, and the second grayscale threshold value may be 20 grayscale levels.

Please refer to FIG. 3A and FIG. 3B. FIG. 3A and FIG. 3B are schematic diagrams of a pixel display embodiment. In the embodiment of FIG. 3A, when the grayscale value of the first group of grayscale data is greater than the first grayscale threshold value, and the grayscale value of the second group of grayscale data is greater than the second grayscale threshold value, the data driver 10 will Corresponding display data is generated according to the first set of grayscale data and the second set of grayscale data, so that the first pixels 30a and the second pixels 30b are displayed according to the corresponding display data. In the embodiment of FIG. 3B, when the grayscale value of the first group of grayscale data is greater than the first grayscale threshold value, but the grayscale value of the second group of grayscale data is less than or equal to the second grayscale threshold value, that is, The second set of grayscale data has relatively low brightness. The data driver 10 generates corresponding display data based on the first set of grayscale data. The data driver 10 generates a non-luminous signal based on the second set of grayscale data, so the first pixel 30a performs normal display according to the corresponding display data, but the second pixel 30b does not perform light-emitting display because it receives a non-light-emitting signal, and its display effect is shown in FIG. 3B. In addition, in the embodiment of displaying a monochrome screen, the display can also be performed in the manner described above. The difference is that when the pixels 30 need to be displayed according to the display data, each pixel 30 has only a sub-pixel corresponding to a specific primary color. 31 will glow.

In the present invention, the display effect under low brightness can be adjusted by changing the ratio of the first pixel 30a and the second pixel 30b in the pixel group 30G, that is, when the second pixel 30b does not emit light. Display effect. For example, in the embodiment of FIG. 3B, when the second pixel 30b does not emit light, the grayscale value displayed by the pixel group 30G at this time is substantially half of the grayscale data of the first group. Take the first group of grayscale data as 10 grayscales as an example, that is, the grayscale value displayed by the pixel group 30G at this time is 5 grayscales. Taking FIG. 2B as an example, the pixel group 30G includes a first pixel 30a and two second pixels 30b. Taking the first group of grayscale data as 9 grayscales as an example, when the second pixel 30b does not emit light At this time, because two of the three pixels do not emit light, the gray value displayed for this pixel group 30G is one third of the gray data of the first group, which is 3 gray. Order. Therefore, by doing this, the pixel group 30G can display a grayscale value lower than the first group of grayscale data according to demand.

In addition, in different display frames, the first pixel 30a and the two second pixels 30b are displayed alternately, which will be further described below with reference to FIGS. 4A, 4B, and 4C. In this embodiment, each pixel group 30G includes a first pixel 30a and two second pixels 30b. FIG. 4A is an embodiment of a pixel 30 displaying a first frame, FIG. 4B is an embodiment of a pixel displaying a second frame, and FIG. 4C is an embodiment of a pixel displaying a third frame, the first frame, the second frame and the third frame The display time of the frames is adjacent, and the display time of the first frame is earlier than the display time of the second frame, and the display time of the second frame is earlier than the display time of the third frame. Taking the first pixel 30a in the first column of the figure and indicated by the arrow in FIG. 4A as an example, when a second frame is displayed, the first pixel 30a will be replaced by an adjacent second pixel 30b. That is, the second pixel 30b located to the left of the first pixel 30a in FIG. 4A receives the first set of grayscale data in FIG. 4B and converts it to the first pixel 30a indicated by the arrow, and in FIG. 4A The first pixel 30a indicated will be converted to receive the second set of grayscale data as the second pixel 30b. When the third frame is displayed, the first pixel 30a indicated by the arrow in FIG. 4B is converted into the second pixel 30b, and the second pixel 30b to the left of the first pixel 30a indicated by the arrow in FIG. 4B, When the third frame is displayed, it is converted into the first pixel 30a, as shown in FIG. 4C. And at the time of FIG. 4C, all the pixels 30 complete a cycle of pixel interleaving. By doing so, it is possible to effectively prevent a specific pixel from continuing to have a relatively long display time as the first pixel 30a, thereby causing early aging, and thus effectively extending the display life of the display device 100.

In summary, the present invention further summarizes an embodiment of a driving method of a display device. Please refer to FIG. 5. In step 501, at the time of displaying the first frame, each first pixel correspondingly displays an individual first group of grayscale data, and each second pixel correspondingly displays an individual second group of grayscale data. . In step 502, the data driver 10 determines whether to use the corresponding first pixels 30a and second pixels 30b according to the first display data and the second display data. Further, when the data driver 10 judges that the first group of grayscale data is less than or equal to the first grayscale threshold value, the data driver 10 makes the first pixel 30a corresponding to the display not to emit light, and when the data driver 10 judges the second group of grayscale data Less than or equal to the second grayscale threshold, the data driver 10 makes the second pixel 30b corresponding to the display not to emit light. At step 503, at the time of displaying the second frame, part of the first pixel 30a is configured as the second pixel 30b, and part of the second pixel 30b is configured as the first pixel 30a, that is, the first pixel 30a and the second Pixels 30b are interlaced.

In summary, the present invention uses the configuration of pixels and the setting of the grayscale threshold to prevent some pixels from emitting light when displaying a screen with low brightness, thereby improving the uneven brightness and color shift between pixels. In addition, because the viewer's visual acuity is low at low brightness, even if some pixels do not emit light, it will not affect the viewer's experience.

Although the present invention has been disclosed as above by way of example, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and retouches without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention The scope shall be determined by the scope of the post-paid application patent scope.

100‧‧‧ display device

10‧‧‧Data Drive

20‧‧‧Gate driver

30, 30a, 30b ‧‧‧ pixels

31, 31a, 31b, 31c, 31d

30G‧‧‧Pixel Group

DL‧‧‧Data Line

GL‧‧‧Gate line

X‧‧‧ first direction

Y‧‧‧ second direction

R‧‧‧Red primary color

G‧‧‧Green primary color

B‧‧‧Blue primary color

501, 502, 503‧‧‧ steps

FIG. 1 is a schematic diagram of an embodiment of a display device. FIG. 2A is a schematic diagram of a pixel arrangement according to a first embodiment of the present invention. FIG. 2B is a schematic diagram of a second embodiment of the pixel arrangement of the present invention. FIG. 2C is a schematic diagram of a third embodiment of the pixel arrangement of the present invention. FIG. 2D is a schematic diagram of a fourth embodiment of the pixel arrangement of the present invention. FIG. 3A is a schematic diagram of a first embodiment of a pixel display result of the present invention. FIG. 3B is a schematic diagram of a second embodiment of the pixel display result of the present invention. FIG. 4A is a schematic diagram of an embodiment of a pixel displaying a first frame according to the present invention. FIG. 4B is a schematic diagram of an embodiment of a pixel displaying a second frame according to the present invention. FIG. 4C is a schematic diagram of an embodiment of a pixel displaying a third frame according to the present invention. FIG. 5 is a schematic diagram of an embodiment of a method for driving a display device according to the present invention.

Claims (15)

A display device includes: a first pixel correspondingly displaying a first set of grayscale data; a second pixel adjacent to the first pixel and forming a pixel group, the second pixel And correspondingly display a second set of grayscale data; and a data driver electrically coupled to the first pixel and the second pixel, the data driver is used to according to the first set of grayscale data and the second pixel The set of gray scale data determines whether the first pixel and the second pixel are caused to emit light. The display device according to claim 1, wherein the first pixel and the second pixel include a plurality of sub pixels. The display device according to claim 1, wherein when the first set of grayscale data displayed is less than or equal to a first grayscale threshold value, the data driver makes the first pixel not to emit light, and when the second pixel is displayed, The group of grayscale data is less than or equal to a second grayscale threshold value, the data driver makes the second pixel not to emit light, and the second grayscale threshold value is greater than the first grayscale threshold value. The display device according to claim 1, wherein the display device includes a plurality of the first pixels and a plurality of the second pixels, and each of the first pixels and each of the second pixels are in one with each other. The first direction and a second direction are staggered, and the first direction and the second direction are orthogonal to each other. The display device according to claim 1, wherein the display device includes a plurality of the first pixels and a plurality of the second pixels, and the pixel group includes at least one of the first pixels and at least two of the first pixels. Two pixels. The display device according to claim 5, wherein each of the first pixels of the display device is disposed between two of the second pixels in a first direction and a second direction, and the pixel group is The second pixel in one of the groups is disposed between the other second pixel in the group and the first pixel in the pixel group, and the first direction and the second direction are orthogonal to each other. The display device according to claim 1, wherein the display device includes a plurality of the first pixels and a plurality of the second pixels, and the pixel group includes at least two of the first pixels and at least one of the first pixels. Two pixels. The display device according to claim 7, wherein each of the second pixels of the display device is disposed between two of the first pixels in a first direction and a second direction, and the pixel group is One of the first pixels of the group is disposed between the other of the first pixels and the second pixel of the pixel group, and the first direction and the second direction are orthogonal to each other. The display device according to claim 1, wherein the display device includes a plurality of the first pixels and a plurality of the second pixels, and the pixel group includes at least two of the first pixels and at least two of the first pixels. Two pixels. The display device according to claim 9, wherein in a first direction and a second direction, at least two of the pixel groups are adjacent to each other, and at least two of the pixel groups are adjacent to each other. The second pixels are adjacent to each other, one of the pixel groups, the first pixel and one of the second pixels are adjacent to each other, the first direction and the second direction are orthogonal to each other . The display device according to claim 1, wherein the display device includes a plurality of pixels, and the pixels are configured as a plurality of the first pixels and a plurality of the second images when a first frame is displayed. Pixels, at the time of displaying a second frame, some of the first pixels are configured as the second pixels, and some of the second pixels are configured as the first pixels, the first frame and the second frame Is temporally adjacent and the second frame is later than the first frame. A driving method of a display device, the display device includes a data driver and a plurality of pixels, the pixels include a plurality of first pixels and a plurality of second pixels, the first pixels and the second pixels The pixels are adjacent, and the steps include: at the time of displaying a first frame, each of the first pixels correspondingly displays an individual first set of grayscale data, and each of the second pixels correspondingly displays an individual first Two sets of grayscale data; and the data driver determines whether to cause the corresponding first pixel and the second pixel to emit light according to the first set of grayscale data and the second set of grayscale data. The driving method according to claim 12, wherein the data driver is caused to determine whether to use the corresponding first pixel and the second pixel according to the first group of grayscale data and the second group of grayscale data. The step of emitting light further includes: the data driver judges that the first set of grayscale data is less than or equal to a first grayscale threshold, the data driver makes the first pixel corresponding to the display not to emit light; and the data driver judges the second The group of grayscale data is less than or equal to a second grayscale threshold, and the data driver makes the second pixel corresponding to the display not to emit light. The driving method according to claim 13, wherein the second grayscale threshold value is greater than the first grayscale threshold value. The driving method according to claim 12, wherein the steps of the driving method include: when displaying a second frame, the data driver configures some of the first pixels as the second pixels, and some of the first pixels The second pixel is configured as the first pixel, the first frame is temporally adjacent to the second frame, and the second frame is later than the first frame.