CN109817663B - Method for adjusting OLED panel and pixel arrangement structure - Google Patents
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Abstract
The invention discloses a method for adjusting an OLED panel and a pixel arrangement structure. The method comprises the steps of determining the target light-emitting area of each sub-pixel according to the light-emitting material of each sub-pixel after determining that the obtained proportion of the initial brightness of each sub-pixel included in any pixel of the OLED panel does not accord with a preset proportion, so that the target brightness of each sub-pixel under the target light-emitting area accords with the preset proportion, and adjusting the light-emitting area of each sub-pixel according to the target light-emitting area. In the embodiment of the invention, the target brightness of each sub-pixel is in accordance with the preset proportion by adjusting the light-emitting area of each sub-pixel, so that the condition of white light color cast caused by higher or lower brightness of the sub-pixels can be avoided.
Description
Technical Field
The invention relates to the technical field of OLED (organic light emitting diode), in particular to a method for adjusting an OLED panel and a pixel arrangement structure.
Background
Organic Light Emitting Diodes (OLEDs) have self-luminescent properties, and use very thin Organic material coatings and substrates, which emit Light when current passes through them. Different organic materials have different luminance decay rates, and light-emitting devices of the same size made of different organic materials have different initial luminance.
When white light is synthesized by using monochromatic light generated by different light emitting devices, for example, R, G, B white light is synthesized by using three monochromatic lights, the brightness of the three monochromatic lights needs to be maintained in a certain proportion, otherwise, white light color cast is easily caused. In the prior art, a standard RGB sub-pixel arrangement is usually adopted to form a pixel, that is, a square pixel is divided into three equal parts, and each block is given a different color, so as to form a pixel. However, when an organic material is deposited, it is difficult to completely control molecules of the organic material during deposition, and therefore, the luminance of light generated by an organic material of a certain color tends to be high or low, and white light tends to be deviated.
Therefore, a method for adjusting an OLED panel is needed to solve the problem that monochromatic light generated by different light emitting devices in the prior art is prone to color shift when white light is synthesized.
Disclosure of Invention
The embodiment of the invention provides a method for adjusting an OLED panel and a pixel arrangement structure, which aim to solve the technical problem that color cast is easily caused when monochromatic light generated by different light emitting devices is synthesized into white light in the prior art.
The embodiment of the invention provides a method for adjusting an OLED panel, which comprises the following steps:
acquiring initial brightness of each sub-pixel included in any pixel of the OLED panel;
if the proportion of the initial brightness of each sub-pixel is determined not to accord with the preset proportion, determining the target light-emitting area of each sub-pixel according to the light-emitting material of each sub-pixel so as to enable the target brightness of each sub-pixel under the target light-emitting area to accord with the preset proportion;
and adjusting the light-emitting area of each sub-pixel according to the target light-emitting area.
Optionally, adjusting the light emitting area of each sub-pixel according to the target light emitting area includes:
setting a protective cover for each sub-pixel according to the target light-emitting area of each sub-pixel; the area of the protective cover is consistent with the target light-emitting area of the corresponding sub-pixel;
and removing the regions which are not covered by the protective cover in each sub-pixel by adopting laser.
Optionally, the method further comprises:
detecting the brightness decay rate of each sub-pixel included in any pixel of the OLED panel at the current moment;
determining a preset brightness attenuation rate at the current moment according to the corresponding relation between the service time of the OLED panel and the preset brightness attenuation rate;
if it is determined that the brightness attenuation rate of each sub-pixel after the adjustment of the light emitting area is greater than the preset brightness attenuation rate at the current moment, the current density of the sub-pixel corresponding to the brightness attenuation rate greater than the preset brightness attenuation rate at the current moment is reduced.
Optionally, the method further comprises:
if the brightness attenuation rate of each sub-pixel after the light-emitting area is adjusted is determined to be smaller than the preset brightness attenuation rate at the current moment, the current density of the sub-pixel corresponding to the brightness attenuation rate smaller than the preset brightness attenuation rate at the current moment is increased.
The embodiment of the invention provides an OLED pixel arrangement structure, which comprises:
at least one first sub-pixel row including a plurality of first sub-pixels sequentially arranged in a first direction;
at least one second sub-pixel row including a plurality of second and third sub-pixels arranged at intervals along the first direction; each first sub-pixel is arranged between the second sub-pixel and the third sub-pixel along a second direction perpendicular to the first direction;
and the adjacent first sub-pixel, second sub-pixel and third sub-pixel between the first sub-pixel row and the second sub-pixel row form a pixel.
Optionally, the light emitting efficiency of the first sub-pixel is greater than the light emitting efficiency of the second sub-pixel and greater than the light emitting efficiency of the third sub-pixel.
Optionally, the first direction is a row direction, and the second direction is a column direction; or,
the first direction is a column direction and the second direction is a row direction.
Optionally, an area of any one of the first sub-pixel, the second sub-pixel, and the third sub-pixel has a positive correlation with a luminance decay rate of the corresponding light-emitting material.
Optionally, the shape of the first sub-pixel is a diamond;
the shape of the second sub-pixel and the shape of the third sub-pixel are octagonal.
The embodiment of the invention provides a method for adjusting an OLED panel, which comprises the steps of determining a target light-emitting area of each sub-pixel according to a light-emitting material of each sub-pixel if the proportion of the initial brightness of each sub-pixel included in any pixel of the obtained OLED panel does not accord with a preset proportion, so that the target brightness of each sub-pixel under the target light-emitting area accords with the preset proportion, and adjusting the light-emitting area of each sub-pixel according to the target light-emitting area. In the embodiment of the invention, the target brightness of each sub-pixel is in accordance with the preset proportion by adjusting the light-emitting area of each sub-pixel, so that the condition of white light color cast caused by higher or lower brightness of the sub-pixels can be avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic flowchart illustrating a method for adjusting an OLED panel according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating a process of adjusting the light-emitting area of each sub-pixel by using laser according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating another method for adjusting an OLED panel according to an embodiment of the present invention;
FIG. 4a is a schematic diagram of an OLED pixel arrangement structure according to an embodiment of the present invention;
FIG. 4b is a schematic diagram of an RGB pixel arrangement structure according to an embodiment of the present invention;
FIG. 4c is a second schematic diagram of an OLED pixel arrangement structure according to an embodiment of the present invention;
FIG. 4d is a third schematic diagram of an OLED pixel arrangement structure according to the present invention;
FIG. 5a is a schematic diagram of a pixel according to an embodiment of the present invention;
FIG. 5b is a schematic diagram of another pixel according to an embodiment of the present invention;
FIG. 6a is a diagram illustrating the luminance decay rate of an RGB pixel in the prior art;
FIG. 6b is a diagram illustrating the luminance decay rate of RGB pixels according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 exemplarily shows a schematic flow chart corresponding to a method for adjusting an OLED panel provided in an embodiment of the present invention, as shown in fig. 1, the method specifically includes the following steps:
In the embodiment of the invention, if the proportion of the initial brightness of each sub-pixel is determined not to accord with the preset proportion, the target brightness of each sub-pixel can accord with the preset proportion by adjusting the light-emitting area of each sub-pixel, so that the condition of white light color cast caused by the higher or lower brightness of the sub-pixel can be avoided.
It should be noted that the method for adjusting the OLED panel provided in the embodiment of the present invention can be applied to a full-color OLED panel including sub-pixels of various colors, and the color of the sub-pixel is not limited herein. For convenience of description, the following embodiments take the case where any pixel of the OLED panel includes only subpixels of three colors of RGB as an example.
Specifically, in step 101 and step 102, the initial luminance of each sub-pixel included in any pixel of the OLED panel is obtained, and whether the ratio of the initial luminance of each sub-pixel meets a preset ratio or not, that is, whether the initial luminance of the sub-pixels of three colors of RGB meets the preset ratio or not is determined. Wherein the preset proportion is determined by the person skilled in the art according to experience and practical conditions.
Setting the preset ratio to be 1:1:1, in one example, the initial brightness of the sub-pixels of the three acquired RGB colors: the initial luminance of the R sub-pixel is Y1-100, the initial luminance of the G sub-pixel is Y2-150, and the initial luminance of the B sub-pixel is Y3-100; from this, Y1: y2: y3 is 1:1.5:1, which does not meet the preset ratio, and the initial luminance of the G sub-pixel is greater than the initial luminance required by the preset ratio (or it can be considered that the initial luminance of the R sub-pixel and the initial luminance of the B sub-pixel are less than the initial luminance required by the preset ratio). In another example, the initial luminance of the acquired RGB three-color sub-pixels: the initial luminance of the R sub-pixel is Y1-100, the initial luminance of the G sub-pixel is Y2-150, and the initial luminance of the B sub-pixel is Y3-150. From this, Y1: y2: y3 is 1:1.5:1.5, which does not conform to the preset ratio, and the initial luminances of the G and B sub-pixels are both greater than the initial luminance required by the preset ratio (or may be considered that the initial luminance of the R sub-pixel is less than the initial luminance required by the preset ratio), at this time, the luminances of the G and B sub-pixels need to be adjusted, so that the adjusted luminances of the RGB sub-pixels conform to the preset ratio.
In the embodiment of the invention, for the light source with the light-emitting area, the light-emitting area of the light source can influence the brightness of the light source on the premise of not changing the light-emitting material, so that the brightness of the light source can be improved or reduced by changing the light-emitting area of the sub-pixel, and the brightness of the RGB sub-pixel is in accordance with the preset proportion.
Based on this, in the first example described above, the area of the G sub-pixel may be reduced, or the areas of the R sub-pixel and the B sub-pixel may be increased, so that the luminance of the RGB sub-pixels conforms to the preset ratio. In the second example described above, the areas of the G and B sub-pixels may be reduced, or the area of the R sub-pixel may be increased, so that the luminance of the RGB sub-pixels meets a preset ratio.
Here, considering that the method in the embodiment of the present invention may be suitable for adjusting an OLED panel that has been manufactured and molded, and for an OLED panel that has been manufactured and molded, it is difficult to increase the area of each sub-pixel to increase the brightness of each sub-pixel in terms of process, therefore, in the embodiment of the present invention, regarding the above-mentioned sub-pixel that does not meet the preset ratio, the consideration may be given to the sub-pixel whose initial brightness is greater than the requirement of the preset ratio, so as to reduce the brightness by reducing the area of the sub-pixel, thereby achieving the purpose that the ratio of each sub-pixel meets the preset ratio. By adopting the mode, the operation is simple, the realization is easy, and the production cost can be reduced.
In step 103, there are various methods for adjusting the light emitting area of each sub-pixel according to the target light emitting area, and one possible implementation manner is to shield the area of each sub-pixel except the target light emitting area by using a material with low light transmittance.
Another possible implementation is to remove the regions of the sub-pixels except for the target light-emitting area by using laser. The method specifically comprises the following steps:
step one, arranging a protective cover for each sub-pixel according to the target light-emitting area of each sub-pixel; the area of the protective cover is consistent with the target light-emitting area of the corresponding sub-pixel.
Specifically, in the embodiment of the present invention, the disposing of the protective cover for each sub-pixel may be individually disposing the protective cover for each sub-pixel; alternatively, one protective cover may be provided for all the sub-pixels, which is not particularly limited.
And step two, removing the regions which are not covered by the protective cover in each sub-pixel by adopting laser.
Specifically, as shown in fig. 2, for a schematic flow chart of adjusting the light emitting area of each sub-pixel by using laser according to an embodiment of the present invention, if a pixel is configured by using a standard RGB sub-pixel arrangement, the light emitting areas of the sub-pixels before adjustment are consistent; if the proportion of the initial brightness of the RGB sub-pixels is determined not to be in accordance with the preset proportion, determining the target light-emitting area of the RGB pixels according to the light-emitting materials of the RGB sub-pixels; according to the target light-emitting area of the RGB pixel, independently arranging a protective cover for each sub-pixel; and removing the area which is not covered by the protective cover in the RGB sub-pixels by adopting laser to obtain the adjusted light-emitting area of each sub-pixel.
Furthermore, as the service time is prolonged, the brightness of each sub-pixel is attenuated, and after the light emitting area of each sub-pixel is adjusted, the brightness attenuation rate of each sub-pixel can be detected to determine the brightness of each sub-pixel in different service times, so that the brightness proportion of each sub-pixel in different service times is ensured to accord with the preset proportion. Specifically, the embodiment of the present invention may detect the luminance decay rate of each sub-pixel in real time, or may periodically detect the luminance decay rate of each sub-pixel, so as to reduce the operation load of the detection system.
Fig. 3 schematically shows a flow chart corresponding to another method for adjusting an OLED panel according to an embodiment of the present invention, and as shown in fig. 3, the method specifically includes the following steps.
And 304, reducing the current density of the sub-pixel corresponding to the brightness attenuation rate larger than the preset brightness attenuation rate at the current moment.
And 305, increasing the current density of the sub-pixel corresponding to the brightness attenuation rate smaller than the preset brightness attenuation rate at the current moment.
In step 306, the current density of each sub-pixel is not adjusted.
It should be noted that the method for adjusting the current density of each sub-pixel by detecting the luminance decay rate of each sub-pixel provided in the embodiment of the present invention may be applied to the OLED panel after the light emitting area of the sub-pixel is adjusted; alternatively, the method can be applied to the OLED panel alone, and is not limited in particular.
In another embodiment of the present invention, the arrangement structure of the OLED pixels may be changed to make the target brightness of each sub-pixel conform to the preset ratio, so as to avoid the white color shift caused by the higher or lower brightness of the sub-pixels. Fig. 4a schematically illustrates an OLED pixel arrangement structure provided in an embodiment of the present invention, and as shown in fig. 4a, the OLED pixel arrangement structure includes:
at least one first subpixel row 410 including a plurality of first subpixels 411 sequentially arranged in a first direction;
at least one second subpixel row 420 including a plurality of second subpixels 421 and third subpixels 422 arranged at intervals from each other in the first direction; each first sub-pixel 411 is arranged between the second sub-pixel 421 and the third sub-pixel 422 along a second direction perpendicular to the first direction;
the first sub-pixel 411, the second sub-pixel 421 and the third sub-pixel 422 adjacent to each other between the first sub-pixel row 410 and the second sub-pixel row 420 form a pixel.
Specifically, the light emitting efficiencies of the first sub-pixel, the second sub-pixel and the third sub-pixel are different, in the embodiment of the present invention, two sub-pixels with similar light emitting efficiencies are arranged at the second sub-pixel row at intervals, and a sub-pixel with a larger difference from the light emitting efficiencies of the other two sub-pixels is arranged in the first sub-pixel row. That is, in the structure shown in fig. 4a, the light emitting efficiency of the first sub-pixel is greater than the light emitting efficiency of the second sub-pixel, and is greater than the light emitting efficiency of the third sub-pixel. For example, as shown in fig. 4B, which is a schematic diagram of an arrangement structure of RGB pixels in an embodiment of the present invention, if the light emitting efficiency of the B sub-pixel is the largest, the light emitting efficiencies of the R sub-pixel and the G sub-pixel are similar, and the light emitting efficiencies of the R sub-pixel and the G sub-pixel are both smaller than the B sub-pixel, the B sub-pixel may be used as the first sub-pixel, and the R sub-pixel and the G sub-pixel may be respectively used as the second sub-pixel and the third sub-pixel.
In the embodiment of the invention, the first direction is a row direction, and the second direction is a column direction; or the first direction is a column direction and the second direction is a row direction; or the first direction is a direction forming a certain angle with the horizontal plane, and the second direction is a direction perpendicular to the first direction, where the angle may be adjusted according to an actual situation, and is not particularly limited. For example, in the pixel arrangement structure shown in fig. 4a, the first direction is a row direction, and the second direction is a column direction; alternatively, as shown in fig. 4c, in the pixel arrangement structure shown in fig. 4c, the first direction is a column direction and the second direction is a row direction; alternatively, as shown in fig. 4d, in the pixel arrangement structure shown in fig. 4d, the first direction is a direction forming an angle of 45 ° with the horizontal plane, and the second direction is a direction forming an angle of-45 ° with the horizontal plane.
Further, in the embodiment of the present invention, an area of any one of the first sub-pixel, the second sub-pixel, and the third sub-pixel has a positive correlation with a luminance decay rate of the corresponding light emitting material.
Furthermore, in the embodiment of the present invention, the shape of the first sub-pixel is a diamond, and the shape of the second sub-pixel and the shape of the third sub-pixel are octagon.
According to the OLED pixel arrangement structure described in the above, in the embodiment of the present invention, there are various ways of forming one pixel by the first sub-pixel, the second sub-pixel, and the third sub-pixel, and one possible implementation manner is that, as shown in fig. 5a, for a schematic diagram of a formed pixel provided in the embodiment of the present invention, any one first sub-pixel in the first sub-pixel row, and the second sub-pixel and the third sub-pixel adjacent to the first sub-pixel in the adjacent second sub-pixel row form one pixel.
Further, as shown in fig. 5a, the first sub-pixel, the second sub-pixel, and the third sub-pixel form an isosceles triangle, and the base angle of the isosceles triangle is 45 °.
Another possible implementation manner is, as shown in fig. 5b, that is, as another schematic diagram of a pixel according to an embodiment of the present invention, any one first sub-pixel in a first sub-pixel row, a second sub-pixel adjacent to the first sub-pixel in an adjacent second sub-pixel row, and a third sub-pixel adjacent to the first sub-pixel in another adjacent second sub-pixel row form a pixel;
further, as shown in fig. 5b, the first sub-pixel, the second sub-pixel, and the third sub-pixel are located on a straight line, and the straight line forms an angle of N × 45 ° with the horizontal plane, where N is an odd number.
In the embodiment of the present invention, with the pixel structure, on one hand, since each sub-pixel is in the shape of a polygon with more than or equal to four sides, for example, an octagonal sub-pixel, the light emitting area of the sub-pixel with lower light emitting efficiency can be increased, and the luminance of the sub-pixel with lower light emitting efficiency can be further improved, so that the target luminance of the sub-pixel meets the preset proportion, and the situation of white light color cast caused by higher or lower luminance of the sub-pixel is avoided; on the other hand, according to the pixel arrangement mode, when the pixels of the adjacent rows display the image, climbing transition compensation can be formed, the corresponding line segments with two staggered ends can be fitted into an inclined climbing slope, and the sawtooth display phenomenon can be weakened.
Based on the above description, the embodiment of the invention compares the luminance attenuation ratios of the RGB sub-pixels before and after adjustment, fig. 6a is a schematic diagram of the luminance attenuation ratios of the RGB pixels in the prior art, and fig. 6b is a schematic diagram of the luminance attenuation ratios of the RGB pixels in the embodiment of the invention. As shown in fig. 6a, the brightness decays of RGB before the adjustment are B, G, R in sequence before the use time is 250 hours; after the usage time is 250 hours, the luminance decay of the RGB before the adjustment is G, B, R in turn, and as can be seen from fig. 6a, as the usage time is prolonged, the luminance decay rate of the RGB has a larger difference from the preset luminance decay rate. After the adjustment, as shown in fig. 6b, the adjusted RGB luminance attenuation rate substantially matches the predetermined luminance attenuation rate. Therefore, in the embodiment of the present invention, the light emitting area of each sub-pixel may be adjusted, for example, the light emitting area of the sub-pixel with too high brightness is removed, or the arrangement structure of the pixels is changed, so that the target brightness of each sub-pixel meets the preset ratio, and the white color cast caused by the higher or lower brightness of the sub-pixel can be avoided.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A method of tuning an organic light emitting diode, OLED, panel, the method comprising:
acquiring initial brightness of each sub-pixel included in any pixel of the OLED panel;
if the proportion of the initial brightness of each sub-pixel is determined not to accord with the preset proportion, determining the target light-emitting area of each sub-pixel according to the light-emitting material of each sub-pixel so as to enable the target brightness of each sub-pixel under the target light-emitting area to accord with the preset proportion;
setting a protective cover for each sub-pixel according to the target light-emitting area of each sub-pixel; the area of the protective cover is consistent with the target light-emitting area of the corresponding sub-pixel;
and removing the regions which are not covered by the protective cover in each sub-pixel by adopting laser.
2. The method of claim 1, further comprising:
detecting the brightness decay rate of each sub-pixel included in any pixel of the OLED panel at the current moment;
determining a preset brightness attenuation rate at the current moment according to the corresponding relation between the service time of the OLED panel and the preset brightness attenuation rate;
and for any sub-pixel, if the brightness attenuation rate of the sub-pixel is determined to be greater than the preset brightness attenuation rate at the current moment, reducing the current density of the sub-pixel.
3. The method of claim 2, further comprising:
and if the brightness attenuation rate of the sub-pixel is determined to be smaller than the preset brightness attenuation rate at the current moment, increasing the current density of the sub-pixel.
4. The OLED pixel arrangement structure is characterized in that a target light-emitting area of each sub-pixel is determined according to a light-emitting material of each sub-pixel, and the initial brightness of each sub-pixel which does not accord with a preset proportion in an organic light-emitting diode (OLED) panel is changed into the target brightness of each sub-pixel which accords with the preset proportion through the OLED pixel arrangement structure; the target light-emitting area of each sub-pixel is obtained by arranging a protective cover for each sub-pixel, wherein the protective cover is consistent with the target light-emitting area of each sub-pixel; the method for removing the regions, which are not covered by the protective cover, in each sub-pixel by using laser comprises the following steps:
at least one first sub-pixel row including a plurality of first sub-pixels sequentially arranged in a first direction;
at least one second sub-pixel row including a plurality of second and third sub-pixels arranged at intervals along the first direction; each first sub-pixel is arranged between the second sub-pixel and the third sub-pixel along a second direction perpendicular to the first direction;
and the adjacent first sub-pixel, second sub-pixel and third sub-pixel between the first sub-pixel row and the second sub-pixel row form a pixel.
5. The OLED pixel arrangement structure of claim 4, wherein the first sub-pixel has a luminous efficiency greater than that of the second sub-pixel and greater than that of the third sub-pixel.
6. The OLED pixel arrangement structure of claim 4, wherein the first direction is a row direction and the second direction is a column direction; or,
the first direction is a column direction and the second direction is a row direction.
7. The OLED pixel arrangement structure according to claim 4, wherein an area of any one of the first sub-pixel, the second sub-pixel, and the third sub-pixel has a positive correlation with a luminance decay rate of the corresponding light emitting material.
8. The OLED pixel arrangement structure according to any one of claims 4 to 7, wherein the first sub-pixel is diamond-shaped;
the shape of the second sub-pixel and the shape of the third sub-pixel are octagonal.
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| CN102856351A (en) * | 2012-06-14 | 2013-01-02 | 友达光电股份有限公司 | Organic electroluminescent display panel and manufacturing method thereof |
| CN103915571A (en) * | 2014-01-27 | 2014-07-09 | 上海天马有机发光显示技术有限公司 | AMOLED display panel and film manufacturing method and display device |
| CN103985738A (en) * | 2014-05-08 | 2014-08-13 | 京东方科技集团股份有限公司 | Pixel structure and display device |
| CN104201151A (en) * | 2014-08-26 | 2014-12-10 | 深圳市华星光电技术有限公司 | Thin film transistor array substrate and pixel darkening processing method thereof |
| CN107275360A (en) * | 2016-04-01 | 2017-10-20 | 乐金显示有限公司 | Organic light-emitting display device |
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