CN109445163B

CN109445163B - Display substrate, display panel and display device including the same

Info

Publication number: CN109445163B
Application number: CN201910007924.7A
Authority: CN
Inventors: 张云天; 江鹏; 戴珂; 杨海鹏; 吴忠厚; 张春旭; 邓亚飞; 许晨; 李萌萌
Original assignee: BOE Technology Group Co Ltd; Hefei BOE Display Lighting Co Ltd
Current assignee: BOE Technology Group Co Ltd; Hefei BOE Display Lighting Co Ltd
Priority date: 2019-01-04
Filing date: 2019-01-04
Publication date: 2021-09-07
Anticipated expiration: 2039-01-04
Also published as: CN109445163A

Abstract

Embodiments of the present invention provide a display substrate, a display panel and a display device including the display substrate. The display substrate includes a base substrate, and a display area of the base substrate has at least one sub-pixel array with 4 rows and 6 columns. The sub-pixels in the first row of the sub-pixel array are respectively blue, red, green, red, blue, and green, the sub-pixels in the second row are red, green, blue, blue, green, and red, respectively, and the third row is in sequence. The sub-pixels are respectively green, red, blue, red, blue, and green in sequence, and the sub-pixels in the fourth row are respectively red, green, blue, green, blue, and red.

Description

Display substrate, display panel including the same, and display apparatus

Technical Field

The invention relates to the technical field of display, in particular to a display substrate, a display panel comprising the display substrate and display equipment comprising the display substrate.

Background

In recent years, display devices of various sizes have been widely used in daily life and industrial production, and the demand for image display quality of the display devices has been increasing. In order to evaluate the quality and performance of a manufactured display product (e.g., an LCD panel, an OLED display panel, etc.), a specific data signal is usually applied to the display product to determine whether the quality of a picture displayed by the display product under the driving of the data signal meets a predetermined requirement, and accordingly, whether the manufactured display product meets a relevant index or a customer requirement is determined, for example, whether a significant color shift phenomenon exists in the picture displayed under the driving of the data signal is an important criterion for measuring the quality of the display product. However, in practice, customer satisfaction with the quality and performance of the display product remains to be improved.

Disclosure of Invention

The embodiment of the invention provides a display substrate which comprises a substrate base plate, wherein at least one 4-row and 6-column sub-pixel array is arranged in a display area of the substrate base plate. The first row of sub-pixels in the sub-pixel array are respectively blue, red, green, red, blue and green in sequence, the second row of sub-pixels are respectively red, green, blue, green and red in sequence, the third row of sub-pixels are respectively green, red, blue and green in sequence, and the fourth row of sub-pixels are respectively red, green, blue and red in sequence.

According to some embodiments of the present invention, a display substrate includes a color resistance layer attached to the substrate, the color resistance layer including an array of color resistance cells, colors of the color resistance cells in the array of color resistance cells corresponding one-to-one to sub-pixels in the array of sub-pixels.

According to some embodiments of the present invention, the display substrate further comprises a black matrix including a light blocking layer for isolating adjacent color-blocking cells in the array of color-blocking cells.

According to some embodiments of the invention, the display substrate further comprises an electroluminescent material within each sub-pixel of the array of sub-pixels, the electroluminescent material being configured to emit light of a color corresponding to the sub-pixel in which it is located under the influence of an electrical signal.

According to some embodiments of the present invention, the display substrate includes a sub-pixel defining layer on the substrate, the sub-pixel defining layer defining the array of sub-pixels.

According to some embodiments of the present invention, the display substrate includes a plurality of data lines, the odd row of sub-pixels in each column of sub-pixels in the sub-pixel array are electrically connected to a first data line, and the even row of sub-pixels in each column of sub-pixels in the sub-pixel array are electrically connected to a second data line different from the first data line.

According to some embodiments of the invention, the number of data lines is 1 more than the number of columns of sub-pixels of the display substrate.

Further embodiments of the present invention provide a display panel including the display substrate according to any one of the preceding embodiments.

According to some embodiments of the present invention, the display panel further includes an array substrate and a liquid crystal layer disposed between the display substrate and the array substrate.

Further embodiments of the present invention provide a display device including the display panel as described in the foregoing embodiments.

Drawings

Fig. 1 schematically shows an arrangement of sub-pixels in an array of sub-pixels in a display substrate known to the inventors.

Fig. 2A, 3A and 4A are signal timing diagrams of different data signals for testing image display quality of a display device, respectively.

Fig. 2B, 3B and 4B are schematic grayscale diagrams of the sub-pixel array 10 shown in fig. 1 under the driving of the data signals shown in fig. 2A, 3A and 4A, respectively.

Fig. 5 schematically shows the relationship between the stimulus value Wy and the gradation values of the R, G, and B sub-pixels.

Fig. 6 schematically illustrates a sub-pixel arrangement in a sub-pixel array of a display substrate provided according to an embodiment of the present invention.

Fig. 7 to 9 schematically show gray scale diagrams of the sub-pixel array shown in fig. 6 under driving of the data signals shown in fig. 2A, 3A and 4A, respectively.

FIG. 10 schematically illustrates a cross-sectional view of a display panel provided in accordance with one implementation of the invention.

FIG. 11 schematically illustrates a cross-sectional view of a display panel provided in accordance with another implementation of the invention.

Detailed Description

Next, embodiments of the present invention will be described in detail by way of examples. It is to be understood that the embodiments of the present invention are not limited to the examples set forth below, and that modifications and variations may be made in the illustrated embodiments by those skilled in the art using the principles and spirit disclosed herein, resulting in other embodiments of different forms which will be apparent to those of skill in the art and which are intended to be within the scope of the present application.

The inventors of the present application have recognized that if the sub-pixels of the display area of the display product are arranged in a Z-inversion manner, power consumption of the display device may be reduced, and it is advantageous to reduce crosstalk between the sub-pixels of the display device. Fig. 1 schematically shows an example of one sub-pixel array unit 10 arranged in a Z-inversion manner, that is, a pixel array of a display device may be composed of a plurality of such sub-pixel array units 10. In such a subpixel arrangement, each data line is electrically connected to subpixels of different rows in an alternating manner. For example, for each column of sub-pixels in the sub-pixel array 10 shown in fig. 1, the sub-pixels in the odd-numbered rows are electrically connected to the same data line, and the sub-pixels in the even-numbered rows are electrically connected to another data line. Thus, any two sub-pixels adjacent in the column direction are electrically connected to different data lines, respectively.

Further, the inventors of the present application know that there is a difference in the charging time of the pixel electrodes of the sub-pixels of different rows due to the influence of the load of the display device and the driving capability of the source driver supplying the data signal, which causes the picture quality to be degraded. In order to reduce the influence of the charging time difference of the pixel electrodes of the sub-pixels in different rows on the quality of the displayed picture, the row driving signal may be provided in a pre-charging manner. That is, before a data signal is written into a corresponding pixel electrode, the pixel switch corresponding to the pixel electrode is turned on in advance, and the pixel electrode is precharged. For example, if the scan time of an active level signal in the row driving signal for each row of sub-pixels is T, the pixel switches of each row of sub-pixels may be allowed to be turned on before the corresponding data signal is written, and the length of the on time (e.g., 2T or 3T) exceeds the scan time T, so that the pre-charging of the pixel electrodes may be achieved.

Nevertheless, the inventors of the present application have found that the screen display quality of the display device is still unsatisfactory in some cases. For example, in the case of a large-sized display device, when a picture quality test is performed (for example, a test is performed using data signals of 1Dot, 2Dot, and 1+2Dot pictures), a phenomenon that a displayed picture is green often occurs, and customer dissatisfaction is caused.

In order to improve the image display quality of the display device, the inventors first tried to explore and analyze the cause of the color shift phenomenon in the displayed picture, which is described in detail below with reference to fig. 1 to 4B.

Fig. 2A, 3A and 4A show timing diagrams of some specific data signals used in production practice to test the picture display quality of a display device, which represent the previously mentioned 1dot picture data signal, 2dot picture data signal and 1+2dot picture data signal, respectively. The special data signals are utilized to enable the display device to display different images, whether the displayed picture has obvious color cast can be judged according to the images, and therefore the quality and the performance of the display device are evaluated.

Fig. 2A schematically shows the timing of signals within one cycle in a 1dot picture data signal. The gray scale diagram shown in FIG. 2B can be obtained by providing the data signals D1-D6 shown in FIG. 2A to the data lines C1-C6, respectively, in the sub-pixel array shown in FIG. 1. Since the data signal D1 received by the data line C1 is always at a high level, the first row and the third row of the first column of sub-pixels R in the sub-pixel array 10 are driven to emit light. Also, in the case of adopting the precharge method, for example, the time for which the pixel switch of the sub-pixel of each row is turned on is maintained at 3T (i.e., the time for precharging the sub-pixels of each row is 2T), and the time for writing the data signal D1 into the two sub-pixels is actually 3T, so that it is possible to ensure that the voltage of the data signal written into the pixel electrode is substantially the same as the target data signal D1, and therefore, the first row and the third row of the sub-pixels R in the first column can achieve a desired gray scale. For the data signal D2 supplied to the data line C2, in which the signal for driving the sub-pixel G is high and the signal for driving the sub-pixel R is low, the first and third rows of sub-pixels G in the second column of sub-pixels in the sub-pixel array 10 are driven to emit light, and the second and fourth rows of sub-pixels R in the first column of sub-pixels are not driven to emit light (in fig. 2B and subsequent figures, non-emitting sub-pixels are represented by black squares). However, in the case of adopting a driving method of precharging the pixel electrode, the G sub-pixel has received a low-level signal supplied to the R sub-pixel of the previous row before each high-level data signal is written to the G sub-pixel. This may actually weaken the charging effect of the high-level data signal on the pixel electrode of the G sub-pixel, resulting in a charging time for the G sub-pixel different from that of the first and third rows of sub-pixels R in the first column of sub-pixels. For example, if the pixel switch of each row of sub-pixels is turned on for a period of 3T (i.e., the time to precharge each row of sub-pixels is 2T), the actual charging time of the first and third rows of sub-pixels G in the second column of sub-pixels is only T because the data signal D2 alternates between a high level and a low level for the period of time T. Thus, the actual charging time of the two G sub-pixels is less than the charging time of the first row and third row of sub-pixels R in the first column of sub-pixels, the two G sub-pixels cannot reach the desired gray value, and the luminance is lower than the first row and third row of sub-pixels R in the first column of sub-pixels, and in fig. 2B, the mark "↓" is added to the G sub-pixel. In fig. 2B and subsequent figures, a mark "↓" is added to each of the sub-pixels which cannot reach the target gradation value. It follows that the difference in charging time between sub-pixels of different rows cannot be completely eliminated with a driving method in which the pixel electrodes are precharged. Likewise, the data signal D3 supplied to the data line C3 causes the G pixels in the second and fourth rows of the second column of subpixels to emit no light, while causing the B subpixels in the first and third rows of the third column of subpixels to emit light. However, the actual charging time of the pixel electrode of the B sub-pixel is lower than the charging time of the first and third rows of sub-pixels R in the first column of sub-pixels, and therefore, the B sub-pixels in the first and third rows of sub-pixels in the third column of sub-pixels cannot reach the desired gray scale value. The data signal D4 received by the data line C4 is always at a low level, so that the sub-pixels B in the second and fourth rows of the sub-pixels in the third column do not emit light, and the sub-pixels R in the first and third rows of the sub-pixels in the fourth column do not emit light. For the data signal D5 supplied to the data line C5, it causes the R sub-pixels in the second and fourth rows of the fourth column of sub-pixels to emit light, and the first and third rows of the fifth column of sub-pixels G to emit no light. However, the R sub-pixels of the second row and the fourth row in the sub-pixel of the fourth column cannot reach the target gradation value. The data signal D6 supplied to the data line C6 causes the second and fourth rows of subpixels G in the fifth column of subpixels to emit light, and the first and third rows of subpixels B in the sixth column of subpixels to emit no light. However, the second and fourth row subpixels G in the fifth column subpixel cannot reach the target grayscale value. Therefore, for the sub-pixel array 10 shown in fig. 1, the gray scale diagram thereof under the driving of the 1dot picture data signal can be schematically represented by fig. 2B.

Fig. 3A and 4A show signal timing charts in one period in the 2dot picture data signal and the 1+2dot picture data signal, respectively. In conjunction with these timing diagrams and the sub-pixel array 10 shown in fig. 1, the gray scales of the sub-pixel array 10 driven by the 2dot picture data signal and the 1+2dot picture data signal can be obtained as shown in fig. 3B and 4B, respectively. For the gray scale graph shown in fig. 2B, the sub-pixels in which the target gray scale value is not reached include 4G sub-pixels, 2B sub-pixels, and 2R sub-pixels. That is, it can be considered that 2 pixels (each including 1R sub-pixel, G sub-pixel, and B sub-pixel) in the sub-pixel array do not reach the target gray scale value, and the color shift phenomenon does not occur for the two pixels. Therefore, the color shift phenomenon of the whole frame of the sub-pixel array 10 is mainly caused by the fact that the 2G sub-pixels cannot reach the target gray scale value. For the gray scale graph shown in fig. 3B, the main reason for the color shift phenomenon is that the target gray scale value is not reached by 2G sub-pixels and 4B sub-pixels. With the gradation diagram shown in fig. 4B, the main reason why the color shift phenomenon occurs is that the 2G sub-pixels and 4R sub-pixels do not reach the target gradation value.

It should be noted here that, in order to facilitate understanding of the gradation diagrams as shown in fig. 2B, 3B, and 4B in conjunction with fig. 1, letters R, G, B, and the like are identified in some periods in the signal diagrams in fig. 2A, 3A, and 4A, but this does not mean that signals of the respective periods in fig. 2A, 3A, and 4A are used only for the sub-pixel R, G or B, and the like. In contrast, what sub-pixels the data signals in fig. 2A, 3A and 4A are supplied to depends on the arrangement of the sub-pixels of the display substrate.

Furthermore, the inventors of the present application have realized that, when the display device is normally displaying, the color coordinates of a single pixel are mainly determined by the gray scale values of the sub-pixels included in the single pixel, and the color coordinates can be calculated by the following formula:

where X, Y, Z denotes the color coordinate values of the pixel and R, G, B denotes the gray scale values of the three sub-pixels. On the basis, corresponding tristimulus values can be obtained

And

their calculation formula is as follows:

(equation 2)

Based on the above formula, the relationship between the stimulus value Wy and the gradation values of the R, G, and B sub-pixels can be obtained as shown in fig. 5. In practice, the variation Δ Wy of Wy value is usually used as a main parameter for judging whether the display device has obvious color cast, and a larger Δ Wy value generally means that the picture of the display panel is green. As can be seen from fig. 5, the Wy value is more influenced by the gray values of the G and B sub-pixels, and less influenced by the gray value of the R sub-pixel. Further, it can be approximated that the influence of the gray value of the G sub-pixel on the Wy value approximately cancels the influence of the gray value of the B sub-pixel on the Wy value.

In view of this, another embodiment of the present invention provides a display substrate, which includes a substrate base. The display area of the substrate base plate is internally provided with at least one sub-pixel array with 4 rows and 6 columns, the sub-pixels in the first row in the sub-pixel array are respectively blue, red, green, red, blue and green in sequence, the sub-pixels in the second row are respectively red, green, blue, green and red in sequence, the sub-pixels in the third row are respectively green, red, blue and green in sequence, and the sub-pixels in the fourth row are respectively red, green, blue and red in sequence. The display substrate herein may be applied to a display device requiring a backlight, and may also be applied to a self-emissive display device requiring no backlight. Fig. 6 schematically illustrates a single sub-pixel array 20 in a display substrate according to an embodiment of the invention. In practice, the display substrate may comprise a plurality of such sub-pixel arrays 20. In some embodiments, all pixels of the display area are not composed of an integer multiple of the sub-pixel array 20, for example, at the edge portion of the pixel area, only a partial sub-pixel in the sub-pixel array may be included.

For the sub-pixel array 20 shown in fig. 6, a 1dot picture data signal, a 2dot picture data signal, and a 1+2dot picture data signal may be applied thereto, respectively, to perform a test of picture display quality. The waveforms of these data signals are identical to those of the signals shown in fig. 2A, 3A, and 4A. In comparison with the sub-pixel array 10 shown in fig. 1, the sub-pixel array 20 shown in fig. 6 only has the arrangement of the sub-pixels changed. Therefore, it can be understood that when the 1dot picture data signal shown in fig. 2A is applied to the sub-pixel array 20 shown in fig. 6, the position of the sub-pixel that does not emit light in the gray scale map of the sub-pixel array 20 and the position of the sub-pixel that cannot reach the target gray scale value due to insufficient charging will be the same as the gray scale map shown in fig. 2B, as shown in fig. 7. Similarly, the gray scale diagrams of the sub-pixel array 20 driven by the 2dot picture data signal and the 1+2dot picture data signal are shown in fig. 8 and 9, respectively.

As can be seen from fig. 8, the sub-pixels that cannot reach the target gray scale include 2R sub-pixels, 2G sub-pixels, and 2B sub-pixels. Therefore, it can be considered that in the sub-pixel array shown in fig. 8, two pixels (each pixel is composed of three sub-pixels of RGB) do not reach the target gradation. However, in both pixels, since all the sub-pixels are dark, the color shift phenomenon does not occur. Similarly, in the gray scale map of the sub-pixel array shown in fig. 9, only two pixels (each pixel is composed of three sub-pixels of RGB) do not reach the target gray scale, and thus the gray scale map shown in fig. 9 has no color shift phenomenon as a whole. As can be seen from the gray scale diagram of the sub-pixel array shown in fig. 7, the sub-pixels that cannot reach the target gray scale include 2R sub-pixels, 3G sub-pixels, and 3B sub-pixels. Therefore, the color shift of the gray scale map of the sub-pixel array shown in fig. 7 is mainly caused by the fact that 1G sub-pixel and 1B sub-pixel cannot reach the target gray scale. However, as discussed previously in connection with fig. 5, the effect of the gray level of a single G sub-pixel on the Wy value may substantially cancel the effect of the gray level of a single B sub-pixel on the Wy value. Therefore, compared with the sub-pixel array 10 shown in fig. 1, the color shift of the sub-pixel array 20 shown in fig. 6 driven by the 1dot picture data signal is significantly reduced. Therefore, with the sub-pixel array shown in fig. 6, the color shift phenomenon occurring in the display device at the time of image display can be reduced, and the image display quality of the display device can be improved.

As described above, the display substrate provided by the embodiment of the invention can be applied to an LCD display device and also can be applied to an OLED display device. In the case that the display substrate is applied to an LCD display device, the display substrate may be a color film substrate of the LCD display device. At this time, the display substrate comprises a color resistance layer attached to the substrate, the color resistance layer comprises a color resistance unit array, and the colors of the color resistance units in the color resistance unit array correspond to the sub-pixels in the sub-pixel array one by one. In some embodiments, the color filter substrate further includes a black matrix, and the black matrix includes a light blocking layer for isolating adjacent color-resisting units in the color-resisting unit array. Fig. 10 is a partial cross-sectional view of such a color filter substrate, and as shown in fig. 10, adjacent color barrier units LA and LB are separated by a light-blocking layer BM. Fig. 10 schematically shows in effect a cross-sectional view of an LCD display panel comprising a color filter substrate as described above, an array substrate 200, and a liquid crystal layer therebetween.

In the case of application of the display substrate to an electroluminescent diode display device, the display substrate further comprises an electroluminescent material within each sub-pixel of the array of sub-pixels, the electroluminescent material being configured to emit light of a color corresponding to the sub-pixel in which it is located under the influence of an electrical signal. Further, the display substrate may further include a sub-pixel defining layer on the substrate, the sub-pixel defining layer defining the sub-pixel array. Fig. 11 schematically shows a substrate 100, a pixel defining layer PDL, and an electroluminescent material layer EL. It will be understood by those skilled in the art that the display substrate may further include any other necessary elements and structures, which are known to those skilled in the art and will not be described herein in detail.

Referring again to fig. 6, according to an embodiment of the present invention, the display substrate includes a plurality of data lines, the odd row sub-pixels in each column of sub-pixels in the sub-pixel array 20 are electrically connected to a first data line, and the even row sub-pixels in each column of sub-pixels in the sub-pixel array are electrically connected to a second data line different from the first data line. That is, the sub-pixels of the display area of the display substrate are arranged in a Z-inversion manner, thereby reducing power consumption of the display device and crosstalk between the sub-pixels of the display device. With the sub-pixel array 20 shown in fig. 6, if it is necessary to supply data signals to all the sub-pixels, another data line is necessary to supply data signals to the R sub-pixels in a column of the rightmost side of the sub-pixel array 20. Therefore, in some embodiments, the number of data lines in the display substrate is 1 more than the number of columns of sub-pixels of the display substrate.

Further embodiments of the present invention provide a display panel including the display substrate according to any one of the preceding embodiments. As previously indicated, the display panel may be an LCD display panel, in which case the display panel further includes an array substrate and a liquid crystal layer disposed between the display substrate and the array substrate.

While certain exemplary embodiments of the invention have been described in detail above, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude the presence of other elements, and the claims do not limit the number of features recited therein. Although some features are recited in different dependent claims, the invention is also intended to cover embodiments in which these features are combined together.

Claims

1. A display substrate, comprising a base substrate having at least one sub-pixel array with 4 rows and 6 columns in a display area of the base substrate, wherein the sub-pixels in the first row of the sub-pixel array are respectively blue in sequence. , red, green, red, blue, and green, the sub-pixels in the second row are red, green, blue, blue, green, and red, respectively, and the sub-pixels in the third row are green, red, blue, red, blue, and green. , and the sub-pixels in the fourth row are respectively red, green, blue, green, blue, and red.

2 . The display substrate according to claim 1 , wherein the display substrate comprises a color resist layer attached to the base substrate, the color resist layer comprises an array of color resist units, the color resist units The colors of the color resist units in the array correspond one-to-one with the sub-pixels in the sub-pixel array.

3 . The display substrate according to claim 2 , wherein the display substrate further comprises a black matrix, and the black matrix comprises a light blocking layer for isolating adjacent color resist units in the color resist unit array. 4 . .

4. The display substrate of claim 1, wherein the display substrate further comprises an electroluminescent material in each subpixel of the subpixel array, the electroluminescent material being configured to be electrically Under the action of the signal, the light of the color corresponding to the sub-pixel where it is located is emitted.

5 . The display substrate of claim 4 , wherein the display substrate comprises a sub-pixel defining layer on the base substrate, the sub-pixel defining layer defining the sub-pixel array. 6 .

6 . The display substrate according to claim 1 , wherein the display substrate comprises a plurality of data lines, and the sub-pixels in odd-numbered rows in each column of sub-pixels in the sub-pixel array are electrically connected. 7 . to a first data line of the plurality of data lines, and even-numbered rows of sub-pixels in each column of sub-pixels in the sub-pixel array are electrically connected to the plurality of data lines adjacent to the first data line For the second data line, the sub-pixel array is arranged in a Z-inversion manner.

7 . The display substrate of claim 6 , wherein the number of the data lines is one more than the number of columns of sub-pixels of the display substrate. 8 .

8. A display panel comprising the display substrate of claim 1.

9 . The display panel according to claim 8 , wherein the display panel further comprises an array substrate and a liquid crystal layer, and the liquid crystal layer is arranged between the display substrate and the array substrate. 10 .

10. A display device comprising the display panel of claim 8 or 9.