TWI707330B - Pixel compensation method for OLED display screen and information processing device using the same - Google Patents

Abstract

The present invention mainly discloses a pixel compensation method for an OLED display screen, which is applied to pixel compensation for an OLED display screen containing at least one light sensing unit, wherein the OLED display screen has a first sub-pixel density A first display area of and a second display area having a second sub-pixel density, and the second sub-pixel density is higher than the first sub-pixel density. In particular, the method of the present invention can obtain aging compensation data and/or color temperature compensation data suitable for the first display area based on the actually measured brightness data. At the same time, based on the difference between the density of the first sub-pixel and the density of the second sub-pixel, the method of the present invention can further obtain aging compensation data and/or color temperature compensation data suitable for the second display area.

Description

Pixel compensation method for OLED display screen and information processing device using the same

The present invention relates to the technical field of self-luminous display screens, and particularly refers to a pixel compensation method applied to an OLED display screen with a built-in Under Display Camera (UDC).

At present, the display screens of smart phones have developed towards full-screen designs. Figure 1 shows a front view of an existing full-screen smart phone. It can be seen from Figure 1 that this type of full-screen smartphone 1a does not really achieve a full-screen design. It still retains a small cover 1Ca to cover the front lens 12a and the ambient light sensor located below the display screen 11a. 13a. Therefore, the display screen of a smart phone with a cover 1Ca design is called a bangs screen. When making bangs screen smartphones, special technology and/or equipment will be used to cut the OLED panel in a free form, so as to reserve a hollow area in the OLED panel. However, this method will increase the complexity of the mobile phone manufacturing process, and a smart phone with a bangs screen will also reduce the user's user experience for the full screen.

Therefore, another smart phone that uses an under-screen camera design to truly achieve a full-screen design is proposed. Figure 2A shows a front view of an existing full-screen smartphone with an under-screen camera operating in a normal display state, and Figure 2B shows a front view of an existing full-screen smartphone with an under-screen camera operating in a self-portrait state. As shown in FIGS. 2A and 2B, the OLED display screen 21a of the full-screen smartphone 2a with an under-screen camera includes a first display area 211a and a second display area 212a, and an under-display camera (UDC) 22a is located below the second display area 212a. It can be seen from FIG. 2A that when the plurality of OLED pixels in the second display area 212a are normally emitting light, the under-screen camera 22a is blocked by the second display area 212a and is not visible. On the contrary, as shown in FIG. 2B, when operating in the Selfie mode, as long as the plurality of OLED pixels in the second display area 212a of the OLED display screen 21a are controlled not to emit light, the ambient light from the outside can pass through the second display area 212a Thus, the under-screen camera 22a can perform photosensitive work.

However, even though the OLED display screen 21a itself is transparent, its light transmittance is only about 40-50%. As a result, when the full-screen smartphone 2a is operating in the selfie mode, the under-screen camera 22a located below the second display area 212a cannot Perfectly complete the photosensitive work, resulting in unsatisfactory picture quality of self-portrait images. In view of this, the design and manufacturer of the smart phone improves the design of the panel structure of the second display area 212a of the OLED display screen 21a, thereby increasing the light transmittance of the second display area 212a. Figure 3A shows a side sectional view of the first display area of the OLED display screen of an existing full-screen smartphone with an under-screen camera, and Figure 3B shows the second display of the OLED display screen of an existing full-screen smartphone with an under-screen camera Side sectional view of the district. As shown in FIGS. 3A and 3B, the basic structure of the panel of the first display area 211a of the OLED display screen 21a includes an anode layer AL, an organic light-emitting material layer EML and a cathode layer CL, and the second display of the OLED display screen 21a The panel base structure of the area 212a includes a transparent anode layer TAL, an organic light emitting material layer EML, and a transparent cathode layer TCL.

Furthermore, in order to further increase the light transmittance of the second display area 212a of the OLED display screen 21a, the design and manufacturer of the smartphone also improves the design of the OLED pixel structure of the second display area 212a. Figure 4A shows the first structural topology of the OLED pixel of the OLED display screen of an existing full-screen smartphone with an under-screen camera, and Figure 4B shows the OLED picture of an existing OLED display screen of a full-screen smartphone with an under-screen camera. The second structure topology is shown in Figure 4C, and Figure 4C shows the third structure topology of the OLED pixel of the existing OLED display screen of a full-screen smartphone with an under-screen camera.

The first structure topology of the OLED pixel of the OLED display screen 21a shown in FIG. 4A is called the Diamond PenTile pixel structure, and the second structure topology of the OLED pixel of the OLED display screen 21a shown in FIG. 4B It is called the Delta pixel structure, and the second structure topology of the OLED pixel of the OLED display screen 21a shown in FIG. 4C is called the G2in1 pixel structure. From FIGS. 4A, 4B, and 4C, it can be easily found that no matter the structure topology of Diamond PenTile, Delta or G2in1 is adopted, the density of OLED sub-pixels in the second display area 212a is much smaller than that in the first display area 211a. The density of the OLED sub-pixels greatly increases the light transmittance of the second display area 212a of the OLED display screen 21a.

To further explain, due to the aging phenomenon of the material of the organic light-emitting material layer EML, the individual OLED sub-pixels of the OLED display screen 21a will have the problem of increased cross-voltage and decreased luminous efficiency, among which the blue OLED sub-pixel Will show more serious aging problems. To put it simply, after the OLED display screen 21a is often used for a long time, even if the same OLED sub-pixel is driven with the same current, the OLED sub-pixel will not exhibit the expected brightness, resulting in color shift of the OLED display screen 21a. . Moreover, as the material aging of the OLED display screen 21a becomes more severe, screen burn-in may also appear on the OLED display screen 21a.

In view of this, the prior art also discloses a display compensation method for OLED display screens, which integrates a plurality of light diodes in the OLED display screen, so that each OLED sub-pixel is adjacent to one light diode, thereby using the light diode Measure the aging characteristics of each OLED sub-pixel. In this way, in the case of an ideal OLED component aging model, the back-end application processor can estimate the data offset of each OLED sub-pixel, so as to make an appropriate calculation for each OLED sub-pixel. Compensation.

Although the pixel compensation technology can be used to solve the color shift of the OLED display screen 21a caused by material aging, the disclosed display compensation method for the OLED display screen is not suitable for direct application to the full-screen smartphone 2a with the under-screen camera 22a OLED display screen 21a. The main reason is that the conventional display compensation method of the OLED display screen does not consider the significant difference between the OLED sub-pixel density of the second display area 212a and the OLED sub-pixel density of the first display area 211a.

It can be seen from the above description that a new pixel compensation method for OLED display screens is urgently needed in the art.

The main purpose of the present invention is to provide a pixel compensation method for an OLED display screen, which is applied to pixel compensation for an OLED display screen containing at least one light sensing unit, wherein the OLED display screen includes a first sub A first display area with a pixel density and a second display area with a second sub-pixel density, and the second sub-pixel density is higher than the first sub-pixel density. The method of the present invention can obtain aging compensation data and/or color temperature compensation data suitable for the first display area based on the actually measured brightness data. At the same time, based on the difference between the density of the first sub-pixel and the density of the second sub-pixel, the method of the present invention can further obtain aging compensation data and/or color temperature compensation data suitable for the second display area.

To achieve the above objective, the present invention proposes a first embodiment of the pixel compensation method of the OLED display screen, which uses a control circuit to implement at least one light sensing unit on an OLED display screen, wherein: The OLED display screen includes a first display area and a second display area. The first display area has a first sub-pixel density, and the second display area has a density higher than the first sub-pixel density. For the second sub-pixel density, the pixel compensation method of the OLED display screen includes the following steps:

(1) Using the at least one light sensing unit to perform a brightness measurement on a plurality of OLED sub-pixels contained in the first display area to obtain the actual brightness attenuation degree of each of the OLED sub-pixels and a first A correction coefficient, and use the first correction coefficient to correct an ideal OLED aging model to obtain a first OLED aging model for determining one of the OLED sub-pixels contained in the first display area Aging compensation information;

(2) Obtain a second correction coefficient based on the first correction coefficient; wherein the second correction coefficient is the ratio of the first correction coefficient and an adjustment factor; and

(3) Use the second correction coefficient to correct the ideal OLED aging model, thereby obtaining a second OLED aging model for determining one of the OLED sub-pixels contained in the second display area. The second aging compensation data .

In the first embodiment, the adjustment factor is proportional to the ratio of the second sub-pixel density to the first sub-pixel density, and the first correction coefficient is the actual brightness attenuation degree and the first display The ratio of the reference brightness attenuation degree of one of the plurality of OLED sub-pixels contained in the area.

In the first embodiment, the light sensing unit is a light sensor selected from the group consisting of a photodiode, a CMOS camera, a CCD camera, and an ambient light sensor.

In the first embodiment, the first aging compensation data and the second aging compensation data both include brightness data and grayscale data.

In addition, to achieve the above object, the present invention also proposes a second embodiment of the pixel compensation method for the OLED display screen, which uses a control circuit to implement at least one light sensing unit on an OLED display screen. Wherein, the OLED display screen includes a first display area and a second display area, the first display area has a first sub-pixel density, and the second display area has a higher density than the first sub-pixel density The pixel compensation method of the OLED display screen includes the following steps:

(1) Using the at least one light sensing unit to perform a brightness measurement on a plurality of OLED sub-pixels contained in the first display area to obtain a first brightness data of each of the OLED sub-pixels, and pass Obtaining the first color temperature compensation data of one of the plurality of OLED sub-pixels contained in the first display area by comparing the first brightness data with a first reference brightness data;

(2) Obtaining the second brightness data of one of the plurality of OLED sub-pixels contained in the second display area based on the first brightness data; wherein, the second brightness data is a combination of the first brightness data and an adjustment factor Ratio; and

(3) Obtain the second color temperature compensation data for one of the plurality of OLED sub-pixels contained in the second display area by comparing the second brightness data with a second reference brightness data.

In the second embodiment, the adjustment factor is proportional to the ratio of the second sub-pixel density to the first sub-pixel density.

In the second embodiment, the light sensing unit is a light sensor selected from the group consisting of a photodiode, a CMOS camera, a CCD camera, and an ambient light sensor.

In the second embodiment, both the first color temperature compensation data and the second color temperature compensation data include luminance data and chromaticity coordinate data.

The present invention also provides an information processing device, which has the aforementioned control circuit and an OLED display screen.

In possible embodiments, the information processing device may be a smart phone, a tablet computer, a notebook computer, an all-in-one computer, a smart watch or an access control device.

In order to enable your reviewer to further understand the structure, features, purpose, and advantages of the present invention, the drawings and detailed descriptions of preferred specific embodiments are attached as follows.

FIG. 5 shows a flowchart of a pixel compensation method for an OLED display screen of the present invention, and FIG. 6 shows a schematic structure diagram of an information processing device applying the pixel compensation method for an OLED display screen of the present invention. The pixel compensation method of an OLED display screen of the present invention is applied to include an image signal processor 11, an application processor 12, a panel driving chip 13, and at least one light sensing unit 101 (for example, under the screen). In any information processing device 1 of an OLED display screen 10 of the camera), for example, a smart phone (as shown in FIG. 6), a tablet computer, a notebook computer, an all-in-one computer, a smart watch, or an access control device. That is, in the present invention, when at least one light sensing unit 101 is used in conjunction, a control circuit including an image signal processor 11, a panel driving chip 13 and an application processor 12 is used to combine the OLED of the present invention The pixel compensation method of the display screen is implemented on the OLED display screen 10 to perform pixel compensation (including aging compensation and/or color temperature compensation) for the display screen of the OLED display screen 10.

As shown in FIG. 6, the OLED display screen 10 includes a first display area 1D1 and a second display area 1D2, and an under display camera (UDC) is arranged below the first display area 1D1. Wherein, the first display area 1D1 has a first sub-pixel density, and the second display area 1D2 has a second sub-pixel density higher than the first sub-pixel density. In more detail, the second display area 1D2 includes a plurality of OLED pixels, wherein the plurality of OLED sub-pixels of the plurality of OLED pixels have a specific pixel structure, such as: Diamond PenTile pixel structure, Delta picture Pixel structure, or G2in1 pixel structure (refer to the aforementioned FIG. 4A, FIG. 4B, and FIG. 4C). It is worth noting that the first display area 1D1 includes a plurality of OLED pixels, and the plurality of OLED sub-pixels of the plurality of OLED pixels also adopt a Diamond PenTile pixel structure, a Delta pixel structure, or G2in1. Pixel structure, but the first sub-pixel density of the first display area 1D1 is designed to be lower than the second sub-pixel density of the second display area 1D2. For example, the second sub-pixel density is N, and the first sub-pixel density is N/d.

As shown in FIGS. 5 and 6, when the OLED display screen 10 is compensated for aging by the pixel compensation method of the OLED display screen of the present invention, step S1 is first performed: driving a plurality of OLEDs contained in the first display area 1D1 The sub-pixels emit light. Next, in step S2, the at least one light sensing unit 101 (for example, an under-screen camera UDC) is used to perform a brightness measurement on a plurality of the OLED sub-pixels contained in the first display area 1D1 to obtain The actual brightness attenuation degree Lm of each of the OLED sub-pixels and a first correction coefficient q. The present invention does not limit the type of the light sensing unit 101, which may be a light diode integrated in the OLED display screen 10. For example, the OLED display screen 10 with an under-screen fingerprint recognition function integrates a light diode array and Touch panel. On the other hand, for the OLED display screen 10 that includes an under-display camera (UDC), the light sensing unit 101 may be a CMOS or CCD under-screen camera. Further, the light sensing unit 101 may also be arranged at an ambient light sensor (Ambient light sensor) below the OLED display screen 10.

FIG. 7 shows a graph of stressing duty versus decay ratio of driving current. It can be seen from FIG. 7 that when the same driving current application time is fixed, the brightness attenuation degree of each of the OLED sub-pixels increases with the intensity of the injected driving current. Therefore, the step S2 obtains the actual brightness attenuation degree Lm of one of the OLED sub-pixels through actual measurement. In more detail, in the case of injecting each of the OLED sub-pixels with a fixed intensity of the driving current A, as shown in FIG. 7, the brightness of each of the OLED sub-pixels will increase with the application time. And gradually decline. Therefore, as long as the brightness value data is obtained at time t ₁ and t ₂ respectively, the actual brightness attenuation degree Lm of each of the OLED sub-pixels can be calculated.

On the other hand, FIG. 8 shows a graph of grayscale data versus brightness data. In FIG. 8, the solid curve represents the relationship curve between the pixel gray scale of the OLED panel (can be regarded as the driving current) and the brightness of the OLED sub-pixels (unit: nits). In practical operation, the brightness data and grayscale data can be made into a graph or a look-up table, so that the back-end application processor 12 can quickly control the panel drive chip and send it to each device through a look-up table. The driving current of the OLED sub-pixel. On the other hand, the dashed curve represents the relationship curve between the pixel gray scale of the OLED panel (which can be regarded as the driving current) and the brightness (unit: nits) of the OLED sub-pixels drawn based on the ideal OLED aging model. It can be seen from Figure 8 that for the same grayscale value, the luminous brightness value corresponding to the OLED sub-pixel should be B1; however, considering the ideal OLED aging model, the luminous brightness value corresponding to the OLED sub-pixel is Drop to B2. Therefore, through B1 and B2, a reference brightness attenuation level Lr can be calculated.

After obtaining the reference brightness decay degree Lr and the actual brightness decay degree Lm, a first correction coefficient q can be calculated, wherein the first correction coefficient q is the actual brightness decay ratio (Measurement brightness decay ratio, Lm). ) And the reference brightness decay ratio (Lr) of the plurality of OLED sub-pixels contained in the first display area 1D1, that is, q=Lm/Lr.

Continuing, the method flow is to perform step S3: use the first correction coefficient q to correct an ideal OLED aging model, and then obtain a first OLED aging model to determine the plurality of OLEDs contained in the first display area 1D1 One of the first aging compensation data for sub-pixels. After obtaining the first aging compensation data, the method step then proceeds to step S4: obtaining a second correction coefficient p based on the first correction coefficient q, where the second correction coefficient p is the first correction coefficient q And an adjustment factor d. The foregoing description has pointed out that the first sub-pixel density of the first display area 1D1 is designed to be lower than the second sub-pixel density of the second display area 1D2. For example, the second sub-pixel density is N, and the first sub-pixel density is N/d. Therefore, it is easy to understand that the adjustment factor d used in step S4 is proportional to the ratio of the second sub-pixel density to the first sub-pixel density.

Finally, the method flow is to perform step S5: use the second correction coefficient p to correct the ideal OLED aging model, and then obtain a second OLED aging model to determine the plurality of OLED sub-pictures contained in the second display area 1D2 One of the second aging compensation information. Since the pixel compensation method of the OLED display screen of the present invention shown in FIG. 5 is used to perform (sub-pixel) aging compensation for an OLED display screen 10, the first aging compensation data and the second aging compensation The data all include brightness data and gray scale data.

In addition to performing (sub-pixel) aging compensation for the OLED display screen 10, the present invention also provides another OLED display screen pixel compensation method capable of performing (pixel) color temperature compensation for the OLED display screen 10. FIG. 9 shows a flowchart of another pixel compensation method for an OLED display screen of the present invention. As shown in FIGS. 9 and 6, when the pixel compensation method of the OLED display screen of the present invention is used to compensate the (pixel) color temperature of the OLED display screen 10, steps S1a and S2a are first performed: driving the first display area The plurality of OLED sub-pixels contained in 1D1 emit light, and then the at least one light sensing unit 101 is used to perform a brightness measurement on the plurality of OLED sub-pixels contained in the first display area 1D1, so as to obtain each The first brightness data (Measurement brightness: L _Rm1 , L _Gm1 , L _Bm1 ) of one of the OLED sub-pixels.

Continuing, the method flow is to perform step S3a: by comparing the first brightness data (L _Rm1 , L _Gm1 , L _Bm1 ) with a first reference brightness data (Reference brightness: L _Rr1 , L _Gr1 , L _Br1 ) To obtain the first color temperature compensation data of one of the plurality of OLED sub-pixels contained in the first display area 1D1. The method of comparing the first brightness data (L _Rm1 , L _Gm1 , L _Bm1 ) and the first reference brightness data (L _Rr1 , L _Gr1 , L _Br1 ) referred to here can refer to the aforementioned steps S2, S3, S4, and S4. The description of step S5, FIG. 7, and FIG. 8 will not be repeated here. It should be known that an OLED pixel (Pixel) is composed of a red OLED sub-pixel, a green OLED sub-pixel, and a blue OLED sub-pixel (Blue sub-pixel). -pixel) composition. Therefore, the (white) light emitted by each OLED pixel is essentially a mixed light of a red light, a green light and a blue light. Therefore, changes in the brightness of any one of red light, green light and blue light will affect the color temperature of the final mixed white light. For this reason, the first color temperature compensation data will include brightness data of each of the OLED sub-pixels and chromaticity coordinate data of each of the OLED sub-pixels.

After obtaining the first color temperature compensation data of the plurality of OLED sub-pixels contained in the first display area 1D1, the method flow then proceeds to step S4a: based on the first brightness data (L _Rm1 , L _Gm1 , L _Bm1 ) Obtain the second brightness data (L _Rm2 , L _Gm2 , L _Bm2 ) of one of the plurality of OLED sub-pixels contained in the second display area 1D2; wherein, the second brightness data (L _Rm2 , L _Gm2 , L _Bm2 ) is The ratio of the first brightness data (L _Rm1 , L _Gm1 , L _Bm1 ) and an adjustment factor d. The foregoing description has pointed out that the first sub-pixel density of the first display area 1D1 is designed to be lower than the second sub-pixel density of the second display area 1D2. For example, the second sub-pixel density is N, and the first sub-pixel density is N/d. Therefore, it is easy to understand that the adjustment factor d used in step S4a is proportional to the ratio of the second sub-pixel density to the first sub-pixel density.

Finally, the method flow based step S5a: obtaining the second data by comparing the second lightness _{(L Rm2, L Gm2, L} Bm2) manner to a second reference luminance data _{(L Rr2, L Gr2, L} Br2) of The display area 1D1 contains the second color temperature compensation data of one of the plurality of OLED sub-pixels. Of course, the second color temperature compensation data will also include brightness data of each of the OLED sub-pixels and chromaticity coordinate data of each of the OLED sub-pixels. Finally, the back-end application processor 12 can perform (pixel) color temperature compensation on the first display area 1D1 and/or the second display area 1D2 of the OLED display screen 10 according to the first color temperature compensation data and/or the second color temperature compensation data . It is added that the so-called reference brightness data refers to, for example, the data shown in FIG. 7, which is based on an ideal OLED aging model, which is built according to the application intensity and/or application time of the driving current The corresponding reference brightness value.

In this way, the above has completely and clearly explained the pixel compensation method of the OLED display screen of the present invention; and from the above, it can be seen that the present invention has the following advantages:

(1) The pixel compensation method of the OLED display screen disclosed in the present invention is applied to pixel compensation for an OLED display screen 10 containing at least one light sensing unit 101, wherein the OLED display screen 10 includes a first Display area 1D1 and a second display area 1D2, the first display area 1D1 has a first sub-pixel density, and the second display area 1D2 has a second sub-picture density higher than the first sub-pixel density Prime density. In particular, the pixel compensation method of the OLED display screen of the present invention can correct the built-in OLED aging model according to the actually measured brightness data, and then obtain the aging compensation data suitable for the first display area 1D1. At the same time, the built-in OLED aging model is corrected according to the difference between the first sub-pixel density and the second sub-pixel density, so as to obtain aging compensation data suitable for the second display area 1D2.

(2) In addition, the pixel compensation method of the OLED display screen of the present invention can also obtain color temperature compensation data suitable for the first display area 1D1 based on the actual measured brightness data, and also based on the actual measured brightness data And the difference between the density of the first sub-pixel and the density of the second sub-pixel to obtain color temperature compensation data suitable for the second display area 1D2.

(3) It is worth noting that when the ambient light sensor is used in conjunction, the interference of external ambient light can be eliminated, so that at least one of the light sensing units 101 (for example: screen The lower camera UDC) measures the accuracy of the brightness of each of the sub-pixels.

(4) Further, the pixel compensation method of the OLED display screen of the present invention can be integrated into the application processor of a smart phone, so that the pixel compensation can be quickly completed without the user looking directly at the screen of the smart phone .

It must be emphasized that the foregoing disclosures in this case are preferred embodiments, and any partial changes or modifications that are derived from the technical ideas of this case and are easily inferred by those who are familiar with the art will not deviate from the patent of this case. Right category.

In summary, regardless of the purpose, means and effects of this case, it is shown that it is very different from the conventional technology, and its first invention is suitable for practicality, and it does meet the patent requirements of the invention. Please check it out and grant the patent as soon as possible. Society is for the best prayer.

<The present invention> Step S1: Drive a plurality of OLED sub-pixels contained in the first display area to emit light Step S2: Use the at least one light sensing unit to perform a brightness measurement on the plurality of OLED sub-pixels contained in the first display area, so as to obtain the actual brightness attenuation degree of each of the OLED sub-pixels and A first correction factor Step S3: Use the first correction coefficient to correct an ideal OLED aging model, and then obtain a first OLED aging model to determine the first aging compensation of one of the plurality of OLED sub-pixels contained in the first display area data Step S4: Obtain a second correction coefficient based on the first correction coefficient; wherein the second correction coefficient is the ratio of the first correction coefficient to an adjustment factor Step S5: Use the second correction coefficient to correct the ideal OLED aging model, and then obtain a second OLED aging model for determining the second aging compensation data of one of the plurality of OLED sub-pixels contained in the second display area 1: Information processing device 10: OLED display screen 101: light sensing unit 1D1: the first display area 1D2: second display area 11: Image signal processor 12: Application processor 13: Panel driver chip Step S1a: Drive a plurality of OLED sub-pixels contained in the first display area to emit light Step S2a: Use the at least one light sensing unit to perform a brightness measurement on the plurality of OLED sub-pixels contained in the first display area, so as to obtain a first brightness data of each of the OLED sub-pixels Step S3a: Obtain the first color temperature compensation data of one of the plurality of OLED sub-pixels contained in the first display area by comparing the first brightness data with a first reference brightness data Step S4a: Obtain a second brightness data of one of a plurality of OLED sub-pixels contained in the second display area based on the first brightness data; wherein, the second brightness data is the first brightness data and an adjustment factor d Ratio of Step S5a: Obtain a second color temperature compensation data value of one of the plurality of OLED sub-pixels contained in the second display area by comparing the second brightness data with a second reference brightness data

＜Acquaintances＞ 1a: Full screen smartphone 11a: display screen 12a: Front lens 13a: Ambient light sensor 1Ca: Cover plate 2a: Full screen smartphone 21a: OLED display screen 211a: The first display area 212a: second display area 22a: Under-screen camera AL: anode layer CL: Cathode layer EML: organic light emitting material layer TAL: Transparent anode layer TCL: Transparent cathode layer

Figure 1 is a front view of an existing full-screen smart phone; Figure 2A shows a front view of an existing full-screen smart phone with an under-screen camera operating in a normal display state; Figure 2B shows a front view of an existing full-screen smart phone with an under-screen camera operating in a Selfie state; Fig. 3A shows a side sectional view of the first display area of the OLED display screen of a conventional full-screen smart phone with an under-screen camera; Figure 3B shows a side cross-sectional view of the second display area of the OLED display screen of an existing full-screen smart phone with an under-screen camera; Figure 4A shows the first structure topology of the OLED pixel of the existing OLED display screen of a full-screen smartphone with an under-screen camera; Figure 4B shows the second structure topology of the OLED pixel of the existing OLED display screen of a full-screen smartphone with an under-screen camera; Figure 4C shows the third structural topology of the OLED pixel of the existing OLED display screen of a full-screen smartphone with an under-screen camera; [L1] 5 shows a flowchart of a pixel compensation method for an OLED display screen of the present invention; 6 shows a schematic structural diagram of an information processing device applying the pixel compensation method of the OLED display screen of the present invention; Figure 7 shows a graph of driving current application time versus decay rate; Figure 8 shows a graph of grayscale data relative to brightness data; and FIG. 9 shows a flowchart of another pixel compensation method for an OLED display screen of the present invention.

Step S1: Drive a plurality of OLED sub-pixels contained in the first display area to emit light

Step S2: Use the at least one light sensing unit to perform a brightness measurement on the plurality of OLED sub-pixels contained in the first display area, so as to obtain a first brightness data of each of the OLED sub-pixels

Step S3: Use the first correction coefficient to correct an ideal OLED aging model, and then obtain a first OLED aging model to determine the first aging compensation of one of the plurality of OLED sub-pixels contained in the first display area data

Step S4: Obtain a second correction coefficient based on the first correction coefficient; wherein the second correction coefficient is the ratio of the first correction coefficient to an adjustment factor

Step S5: Use the second correction coefficient to correct the ideal OLED aging model, and then obtain a second OLED aging model for determining the second aging compensation data of one of the plurality of OLED sub-pixels contained in the second display area

Claims (10)

A pixel compensation method for an OLED display screen is implemented on an OLED display screen containing at least one light sensing unit by using a control circuit, wherein the OLED display screen includes a first display area and a second display Area, the first display area has a first sub-pixel density, and the second display area has a second sub-pixel density higher than the first sub-pixel density; characterized in that the OLED display The pixel compensation methods of the screen include: Using the at least one light sensing unit to perform a brightness measurement on a plurality of OLED sub-pixels contained in the first display area to obtain an actual brightness attenuation degree of each of the OLED sub-pixels and a first correction coefficient And use the first correction coefficient to correct an ideal OLED aging model to obtain a first OLED aging model to determine the first aging compensation data of one of the plurality of OLED sub-pixels contained in the first display area; Obtaining a second correction coefficient according to the first correction coefficient; wherein the second correction coefficient is the ratio of the first correction coefficient to an adjustment factor; and The second correction coefficient is used to correct the ideal OLED aging model to obtain a second OLED aging model for determining the second aging compensation data of one of the plurality of OLED sub-pixels contained in the second display area. According to the pixel compensation method of the OLED display screen described in claim 1, wherein the adjustment factor is proportional to the ratio of the second sub-pixel density to the first sub-pixel density, and the first The correction coefficient is the ratio of the actual brightness attenuation degree to the reference brightness attenuation degree of one of the plurality of sub-pixels contained in the first display area. The pixel compensation method of the OLED display screen described in the first item of the scope of patent application, wherein the light sensing unit is selected from the group consisting of a photodiode, a CMOS camera, a CCD camera, and an ambient light sensor A light sensor of the group. According to the pixel compensation method of the OLED display screen described in the first item of the patent application, the first aging compensation data and the second aging compensation data both include brightness data and grayscale data. A pixel compensation method for an OLED display screen is implemented on an OLED display screen containing at least one light sensing unit by using a control circuit, wherein the OLED display screen includes a first display area and a second display Area, the first display area has a first sub-pixel density, and the second display area has a second sub-pixel density higher than the first sub-pixel density; the pixels of the OLED display screen The compensation method includes the following steps: Use the at least one light sensing unit to perform a brightness measurement on a plurality of OLED sub-pixels contained in the first display area to obtain one of the first brightness data of each of the OLED sub-pixels, and compare the Obtaining the first color temperature compensation data of one of the plurality of OLED sub-pixels contained in the first display area by using the first brightness data and a first reference brightness data; Obtaining second brightness data of one of a plurality of OLED sub-pixels contained in the second display area according to the first brightness data; wherein the second brightness data is the ratio of the first brightness data to an adjustment factor; and The second color temperature compensation data for one of the plurality of OLED sub-pixels contained in the second display area is obtained by comparing the second brightness data with a second reference brightness data. In the pixel compensation method for an OLED display screen described in item 5 of the scope of patent application, the adjustment factor is proportional to the ratio of the second sub-pixel density to the first sub-pixel density. The pixel compensation method for an OLED display screen as described in item 5 of the scope of patent application, wherein the light sensing unit is selected from the group consisting of a photodiode, a CMOS camera, a CCD camera, and an ambient light sensor A light sensor of the group. According to the pixel compensation method of the OLED display screen described in item 5 of the patent application, the first color temperature compensation data and the second color temperature compensation data both include brightness data and chromaticity coordinate data. An information processing device having a control circuit and an OLED display screen as described in any one of items 1 to 8 in the scope of patent application. The information processing device described in item 9 of the scope of patent application is an electronic device selected by the group consisting of smart phones, tablet computers, notebook computers, all-in-one computers, smart watches, and access control devices. The red and blue pixel legends have the same label, which does not correspond to the following picture, and is incorrect

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