CN113593468A

CN113593468A - Pixel driving method and display device

Info

Publication number: CN113593468A
Application number: CN202110951056.5A
Authority: CN
Inventors: 方金钢; 丁录科; 汪军; 王庆贺; 刘军; 闫梁臣
Original assignee: BOE Technology Group Co Ltd; Hefei Xinsheng Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Hefei Xinsheng Optoelectronics Technology Co Ltd
Priority date: 2021-08-18
Filing date: 2021-08-18
Publication date: 2021-11-02
Anticipated expiration: 2041-08-18
Also published as: CN113593468B

Abstract

The invention provides a pixel driving method and a display device, and relates to the technical field of display. Wherein, the method comprises the following steps: firstly, determining a first sub-pixel with the gray scale being not 0 in a target frame, namely a lighted pixel, from a plurality of sub-pixels, wherein the target frame is a current frame or a next frame, then determining a second sub-pixel with the gray scale being 0 in the target frame, namely a non-lighted pixel influenced by NBTIS action generated by the lighted pixel, in an area range including the first sub-pixel, and further adjusting the voltage of a data signal of the second sub-pixel in the target frame from a negative value to a smaller positive value. Therefore, the non-lighted pixels in a certain range around the lighted pixels can be subjected to driving compensation, so that the negative drift of the oxide thin film transistor corresponding to the non-lighted pixels under the NBTIS effect is avoided, and the problem of residual image in the display process is improved.

Description

Pixel driving method and display device

Technical Field

The present invention relates to the field of display technologies, and in particular, to a pixel driving method and a display device.

Background

Thin film transistors based on LTPS (low temperature polysilicon) are gradually replaced by oxide-based thin film transistors in large-sized display devices because it is difficult to ensure uniformity of a large area in terms of laser crystallization.

However, the oxide thin film transistor is sensitive to light, and has very poor NBTIS (Negative voltage thermal Illumination stress, stress under Negative voltage, Temperature and Illumination conditions, also referred to as Negative voltage high Temperature Illumination stability) characteristics, and under the action of the NBTIS stress, the threshold voltage of the oxide thin film transistor may generate a large Negative drift, and further, an image sticking problem may occur in the display process.

Disclosure of Invention

The invention provides a pixel driving method and a display device, which aim to solve the problem of residual image caused by negative drift of threshold voltage of an oxide thin film transistor under the action of NBTIS stress in the conventional display device.

In order to solve the above problem, the present invention discloses a pixel driving method of a display device, applied to a display device, the display device including a plurality of sub-pixels, the sub-pixels being correspondingly provided with oxide thin film transistors for driving the sub-pixels, the method including:

determining a first sub-pixel with a gray level of non-0 in the target frame from the plurality of sub-pixels; the target frame is a current frame or a next frame;

determining a second sub-pixel with the gray scale of 0 in the target frame in the area range including the first sub-pixel;

adjusting the voltage of the data signal of the second sub-pixel in the target frame from a negative value to a preset value; the preset value is greater than 0 and smaller than the threshold voltage of the oxide thin film transistor.

Optionally, before determining a second sub-pixel with a gray level of 0 in the target frame in an area range including the first sub-pixel, the method further includes:

determining a first range centered on the first sub-pixel and satisfying a preset size as an area range including the first sub-pixel.

determining a first range which is centered on a target first sub-pixel and satisfies a preset size for the target first sub-pixel in the first sub-pixels;

determining a second range which is centered on the nearest first sub-pixel and satisfies the preset size, for the nearest first sub-pixel which is closest to the target first sub-pixel;

determining the first range as a region range including the target first sub-pixel when there is no overlap between the first range and the second range;

when there is an overlap between the first range and the second range, determining a circumscribed rectangular range of a range in which the first range and the second range are combined as an area range including the target first sub-pixel.

Optionally, the determining, from the plurality of sub-pixels, a first sub-pixel with a gray level of non-0 in the target frame, where the target frame is a current frame, includes:

performing photocurrent detection on each sub-pixel in the current frame;

determining the sub-pixel with the photocurrent greater than 0 as the first sub-pixel.

Optionally, the determining, in a region range including the first sub-pixel, a second sub-pixel having a gray level of 0 in the target frame includes:

and determining the sub-pixel which is within the area range and the photocurrent is equal to 0 as a second sub-pixel with the gray scale of 0 in the current frame.

Optionally, the determining a first sub-pixel with a gray level of non-0 in the target frame from the plurality of sub-pixels includes:

determining a data signal voltage of each of the sub-pixels in the next frame;

determining a sub-pixel where a data signal voltage in the next frame is a positive value as the first sub-pixel.

Optionally, determining a second sub-pixel with a gray level of 0 in the target frame in an area range including the first sub-pixel comprises:

and determining the sub-pixel which is within the area range and the voltage of the data signal in the next frame is a negative value as a second sub-pixel with the gray scale of 0 in the next frame.

Optionally, the determining the data signal voltage of each of the sub-pixels in the next frame respectively includes:

and determining the data signal voltage of each sub-pixel in the next frame respectively in the time period from the display of the current frame to the display of the next frame.

In order to solve the above problem, the present invention also discloses a display device, which includes a plurality of sub-pixels, the sub-pixels being correspondingly provided with oxide thin film transistors for driving the sub-pixels, and a driving control module configured to:

Optionally, the display device further includes a photoelectric detection device disposed in one-to-one correspondence with the sub-pixels, the photoelectric detection device is disposed in a light emitting direction of the corresponding sub-pixel, and the photoelectric detection device is connected to the driving control module;

the target frame is a current frame, and the photoelectric detection device is configured to perform photoelectric current detection on each sub-pixel in the current frame; sending the detected photocurrent to the drive control module;

the drive control module is specifically configured to receive the photocurrent; determining a sub-pixel with the photocurrent greater than 0 as the first sub-pixel; determining a sub-pixel within the area and the photocurrent equal to 0 as the second sub-pixel.

Compared with the prior art, the invention has the following advantages:

in the embodiment of the invention, first, a first sub-pixel with a gray scale of non-0 in a target frame, namely a lighted pixel, is determined from a plurality of sub-pixels, the target frame is a current frame or a next frame, then, a second sub-pixel with a gray scale of 0 in the target frame, namely an unlighted pixel influenced by an NBTIS action generated by the lighted pixel, is determined in an area range including the first sub-pixel, and then, the voltage of a data signal of the second sub-pixel in the target frame is adjusted from a negative value to a smaller positive value, so that the unlighted pixel in a certain range around the lighted pixel can be driven and compensated, and therefore, the negative drift of an oxide thin film transistor corresponding to the unlighted pixel under the NBTIS action is avoided, and the problem of residual pixels in the display process is improved.

Drawings

Fig. 1 is a flow chart illustrating steps of a pixel driving method according to a first embodiment of the present invention;

FIG. 2 is a diagram illustrating a relationship between photocurrent and luminance of a display device according to a first embodiment of the present invention;

FIG. 3 is a schematic diagram illustrating a range of an area to be compensated according to a first embodiment of the present invention;

FIG. 4 is a schematic diagram illustrating another range of the area to be compensated according to the first embodiment of the present invention;

FIG. 5 is a schematic view illustrating a gray scale of a sub-pixel after driving compensation is performed on the region to be compensated shown in FIG. 3 according to a first embodiment of the present invention;

FIG. 6 is a schematic view illustrating a gray scale of a sub-pixel after driving compensation is performed on the region to be compensated shown in FIG. 4 according to a first embodiment of the present invention;

FIG. 7 is a schematic view of another driving-compensated sub-pixel gray scale within the region to be compensated shown in FIG. 4 according to a first embodiment of the present invention;

fig. 8 is a block diagram showing a display device according to a second embodiment of the present invention;

fig. 9 is a block diagram showing another display device according to a second embodiment of the present invention;

fig. 10 is a schematic diagram illustrating a pixel circuit and a photodetector circuit according to a second embodiment of the present invention;

fig. 11 is a block diagram showing a configuration of another display device according to a second embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Example one

Fig. 1 is a flowchart illustrating steps of a pixel driving method according to a first embodiment of the present invention, where the method is applied to a display device, the display device includes a plurality of sub-pixels, the sub-pixels are correspondingly provided with oxide thin film transistors for driving the sub-pixels, and the sub-pixels and the oxide thin film transistors are specifically disposed on a display panel in the display device, and the method includes the following steps:

step 101: determining a first sub-pixel having a gray level of not 0 in the target frame from the plurality of sub-pixels; the target frame is the current frame or the next frame.

In practical applications, the oxide thin film transistor corresponding to the unlit pixel (i.e., the sub-pixel with the gray scale of 0, hereinafter referred to as a "bright pixel") close to the lit pixel (i.e., the sub-pixel with the gray scale of non-0 ", hereinafter referred to as a" dark pixel ") is easily subjected to NBTIS stress, so that the threshold voltage Vth is rapidly shifted to a negative level, and the dark pixel is likely to have a residual image problem during display. Therefore, the embodiment of the invention can determine the bright pixel firstly, then determine the dark pixel which is affected by the NBTIS action and is arranged at the periphery of the bright pixel, and further perform certain driving compensation on the affected dark pixel, thereby reducing the influence of the NBTIS action, avoiding the residual image formed by rapid negative drift of the threshold voltage Vth of the oxide thin film transistor of the dark pixel, and further improving the display quality.

Specifically, the embodiment of the present invention can implement drive compensation by two pixel driving modes. One way is to determine the dark pixels that have been affected when the current picture is displayed and then drive compensate these dark pixels in real time. Another method is to determine the dark pixels to be affected before the next frame is displayed, and then drive compensate the dark pixels in advance. These two driving methods will be described in detail below.

In an alternative embodiment 1, the target frame may be a current frame, and accordingly, the step 101 may specifically include the following steps:

performing photocurrent detection on each sub-pixel in the current frame;

the sub-pixel having the photocurrent greater than 0 is determined as the first sub-pixel.

In the above-mentioned embodiment 1, when the current frame is displayed, the photocurrent of each sub-pixel can be detected in real time, the sub-pixel is lighted to generate light, the sub-pixel is not lighted to generate light, and the photocurrent can be generated by being excited by the light emitted by the sub-pixel, so that the magnitude of the photocurrent can reflect whether the sub-pixel is lighted or not. When the current frame is displayed, the sub-pixel with the photocurrent greater than 0 is the first sub-pixel with the gray scale not being 0, that is, the bright pixel in the current frame, and the sub-pixel with the photocurrent equal to 0 is the dark pixel in the current frame.

Fig. 2 shows a corresponding relationship between the photocurrent and the luminance of the display device, and as can be seen from fig. 2, the magnitude of the photocurrent is positively correlated with the luminance, that is, the larger the luminance is, the larger the photocurrent is, therefore, the sub-pixel with the photocurrent greater than 0 can be determined as a bright pixel, and the sub-pixel with the photocurrent equal to 0 can be determined as a dark pixel.

In a 2 nd optional implementation manner, the target frame may be a next frame, and accordingly, the step 101 may specifically include the following steps:

determining the data signal voltage of each sub-pixel in the next frame;

the sub-pixel where the data signal voltage in the next frame is a positive value is determined as the first sub-pixel.

In the above-described embodiment 2, the data signal voltage Vdata to be input to each sub-pixel of the display panel may be detected before the next frame is displayed. The sub-pixel with positive Vdata is lighted up in the next frame, and thus the sub-pixel with positive Vdata is the first sub-pixel, i.e. the bright pixel in the next frame. The sub-pixel with Vdata being negative value will not be lighted up in the next frame, therefore, the sub-pixel with Vdata being negative value is the dark pixel in the next frame.

Optionally, in the foregoing 2 nd embodiment, the step of determining the data signal voltage of each sub-pixel in the next frame may specifically include:

in a period from the end of the display of the current frame to the display of the next frame, the data signal voltage of each sub-pixel in the next frame is determined.

The algorithm for predetermining the bright pixels and the dark pixels of the next frame and performing the drive compensation in advance can be performed between two frames, so that the display time of each frame is not influenced.

Step 102: in the area range including the first sub-pixel, a second sub-pixel having a gray level of 0 in the target frame is determined.

In the embodiment of the invention, the dark pixels within a certain range around the bright pixel are influenced by the NBTIS action, while the dark pixels far away from the bright pixel can be considered to be hardly influenced by the NBTIS action, so that the dark pixels influenced by the NBTIS action can be determined within a smaller area including the bright pixel, and only the dark pixels within the smaller range can be subsequently subjected to drive compensation. Thus, a smaller area range including bright pixels may first be determined before step 102.

In an alternative implementation, before step 102, a smaller area range including bright pixels may be determined by:

a first range centered on the first sub-pixel and satisfying a preset size is determined as a region range including the first sub-pixel.

And determining the dark pixel in an area range with a preset size and taking any bright pixel as the center. In practical applications, the preset size may be represented by an n value. For example, if 1 bright pixel affects dark pixels within a distance of 3 peripheral sub-pixels, the value of n may be 3, the predetermined size is the size occupied by 7 × 7 sub-pixels, and the area range is the area range occupied by 7 × 7 sub-pixels with the bright pixel as the center. In practical applications, the area defined by the predetermined size should be greater than or equal to the influence range of NBTIS stress generated by the bright pixels.

Alternatively, the value of n may be adjusted according to the actual situation of the display device, and if the brightness of the display panel is too high or the negative bias voltage corresponding to the 0 gray scale is too large, it indicates that the range of the affected dark pixels around the bright pixels is increased, and therefore, the value of n may be increased, for example, the value of n may be changed to 15, 20 or other larger values, so as to increase the range of the area to be driven and compensated.

In the implementation mode, overlapping conditions of area ranges corresponding to the bright pixels are not required to be considered, the range of the dark pixels to be compensated is relatively accurate, driving compensation is not required to be carried out on the dark pixels exceeding the NBTIS effect influence range during subsequent driving compensation, and power consumption increased by the driving compensation is reduced.

In this implementation manner, if the area ranges corresponding to the bright pixels overlap, the dark pixel of the overlapping portion may be counted only once, and is not counted again subsequently, which is not limited in the embodiment of the present invention.

In another alternative implementation, before step 102, a smaller region range including bright pixels may also be determined by:

for a target first sub-pixel a in the first sub-pixels, determining a first range P which is centered on the target first sub-pixel a and meets a preset size;

determining a second range Q which is centered on the nearest first sub-pixel b and meets a preset size for the nearest first sub-pixel b which is closest to the target first sub-pixel a;

referring to fig. 3, when there is no overlap between the first range P and the second range Q, the first range P is determined as an area range including the target first subpixel a;

referring to fig. 4, when there is an overlap between the first range P and the second range Q, a circumscribed rectangular range R of a range in which the first range P and the second range Q are combined is determined as an area range including the target first subpixel a.

In this implementation manner, referring to fig. 3, for two first sub-pixels where the range to be compensated does not overlap, two area ranges satisfying the preset size may be determined respectively by taking the two first sub-pixels as centers. When the areas to be compensated of the two first sub-pixels do not overlap, the affected dark pixels in the two area areas are counted only once.

Referring to fig. 4, for two first sub-pixels with overlapping ranges to be compensated, a union (i.e., a joint range) of the area ranges corresponding to the two first sub-pixels may be determined, and then a circumscribed rectangular range of the union may be determined. The shape of the circumscribed rectangular range R is a simple regular shape, and in practical application, the circumscribed rectangular range R can be determined only according to the coordinates of two sub-pixels positioned at two end points of a diagonal line in the circumscribed rectangular range R, and compared with a combined range with an irregular shape, the circumscribed rectangular range R is easier to determine, so that the circumscribed rectangular range R is used as an area range to be compensated, and the calculation amount for determining the compensation range is smaller.

In this implementation, by locating the coordinates of two sub-pixels located at two end points of the diagonal line in the circumscribed rectangular range R, that is, locating the coordinates of two points, the range of drive compensation can be determined by a smaller amount of calculation, so that the power consumption increased by drive compensation can be reduced. In addition, in the implementation mode, the dark pixel to be compensated is only compensated once, so that the driving compensation efficiency is improved.

In fig. 3 and 4, the numbers in the subpixels indicate the grayscale values of the subpixels.

After determining the area range to be compensated, corresponding to the embodiment 1 of determining the first sub-pixel in step 101, step 102 may specifically include the following steps:

the sub-pixel within the area and with the photocurrent equal to 0 is determined as the second sub-pixel with the gray level of 0 in the current frame (i.e. the dark pixel to be compensated).

Wherein dark pixels in the area to be compensated can be determined by the photocurrent.

After determining the area range to be compensated, corresponding to the 2 nd implementation of determining the first sub-pixel in step 101, step 102 may specifically include the following steps:

the sub-pixel within the area and having a negative data signal voltage Vdata in the next frame is determined as the second sub-pixel having a gray level of 0 in the next frame (i.e., the dark pixel to be compensated).

Wherein dark pixels in the area to be compensated can be determined by the data signal voltage.

At this point, a dark pixel distribution map to be compensated can be obtained.

Step 103: adjusting the voltage of the data signal of the second sub-pixel in the target frame from a negative value to a preset value; the preset value is greater than 0 and less than the threshold voltage of the oxide thin film transistor.

In this step, the preset value is a positive value smaller than the threshold voltage Vth of the oxide thin film transistor, that is, a smaller positive value, and the preset value is used as the data signal voltage, so that the oxide thin film transistor corresponding to the dark pixel can be prevented from generating fast negative drift of Vth under the NBTIS effect, and further, the generation of afterimage is avoided.

For the second sub-pixel, i.e., the dark pixel, within the range of the region including the first sub-pixel, the data signal voltage Vdata in the target frame may be adjusted from a negative value to a positive value smaller than Vth. For other sub-pixels in the area range, the original Vdata value is kept, and for dark pixels beyond the area range, the original Vdata value is also kept.

In the embodiment of the invention, the Vdata value in the dark pixel distribution diagram to be compensated can be replaced by a positive value smaller than Vth, and is integrated with the original Vdata in other areas to obtain a new Vdata value distribution, and the new Vdata value is input to the display panel to be lightened, so that the aims of improving the afterimage and improving the quality of the display device are fulfilled.

In a specific application, the preset value may be equal to a data signal voltage corresponding to a gray scale of 1 or 2. In one example, the voltage of the data signal corresponding to the gray level of 1 is 0.25V, and the Vdata value of the second sub-pixel in the target frame can be adjusted from a negative value to 0.25V.

The data signal voltage is adjusted from a negative value to a positive value, so that the power consumption of the display device is increased while the afterimage is improved. However, if all the dark pixels in one frame are compensated, although the image sticking can be improved, the power consumption of the display device is greatly increased, and in the embodiment of the invention, only the dark pixels in a smaller range around the bright pixels can be compensated, so that the problem of image sticking is solved, and the degree of power consumption increase is reduced.

Fig. 5 is a schematic view showing the gray scale of the sub-pixel after the driving compensation is performed on the region to be compensated shown in fig. 3, and referring to fig. 5, the gray scale values of the dark pixels in the first range P and the second range Q can be respectively adjusted from 0 to 1.

Referring to fig. 6, which shows a sub-pixel gray scale diagram after driving compensation is performed on the region to be compensated shown in fig. 4, referring to fig. 6, the dark pixel gray scale value in the combined range M of the first range P and the second range Q can be adjusted from 0 to 1.

Referring to fig. 7, which shows another sub-pixel gray scale diagram after driving compensation is performed on the region to be compensated shown in fig. 4, referring to fig. 7, the dark pixel gray scale value in the circumscribed rectangular range R of the range M combined by the first range P and the second range Q can be adjusted from 0 to 1.

Example two

An embodiment of the present invention provides a display device, where the display device includes a plurality of sub-pixels, the sub-pixels are correspondingly provided with oxide thin film transistors for driving the sub-pixels, and the display device further includes a driving control module, and the driving control module is configured to:

determining a first sub-pixel having a gray level of not 0 in the target frame from the plurality of sub-pixels; the target frame is a current frame or a next frame;

adjusting the voltage of the data signal of the second sub-pixel in the target frame from a negative value to a preset value; the preset value is greater than 0 and less than the threshold voltage of the oxide thin film transistor.

Fig. 8 provides a block diagram of a display device according to a second embodiment of the present invention, and referring to fig. 8, a sub-pixel 10 is specifically disposed on a display panel 100 in the display device, the sub-pixel 10 includes a light emitting device 11, the light emitting device 11 at least includes a cathode 111, an anode 112, and a light emitting layer 113 located between the cathode 111 and the anode 112, wherein the anode 112 is connected to an oxide thin film transistor 20, and the display panel 100 is connected to a driving control module 200.

Optionally, the drive control module 30 is further configured to:

Fig. 9 is a block diagram showing another display device according to the second embodiment of the present invention.

Optionally, referring to fig. 9, the display device further includes a photo detector device 30 disposed in one-to-one correspondence with the sub-pixels 10, the photo detector device 30 is disposed in the light emitting direction of the corresponding sub-pixel 10, and the photo detector device 30 is connected to the driving control module 200;

the target frame is a current frame, and the photo-detection device 30 is configured to perform photo-current detection on each sub-pixel in the current frame; sending the detected photocurrent to the driving control module 200;

the drive control module 200 is specifically configured to receive the photocurrent; determining a sub-pixel with the photocurrent greater than 0 as a first sub-pixel; the sub-pixel which is within the area range and the photocurrent is equal to 0 is determined as the second sub-pixel.

In the embodiment of the present invention, the detection of the photocurrent may be implemented by the photo-detection device 30, alternatively, the photo-detection device 30 may specifically be a photo-sensor, and both the photo-detection device 30 and the lead thereof are disposed on the display panel 100, and specifically, with reference to fig. 9, may be disposed on the cover glass 40. The photoelectric detection devices 30 and the sub-pixels 10 are arranged in a one-to-one correspondence mode, so that the resolution of the photoelectric detection devices 30 is consistent with that of the display device, and when the photoelectric detection devices 30 are attached, accurate alignment is performed according to the coordinates of each sub-pixel 10.

Fig. 10 is a schematic diagram illustrating a pixel circuit and a photodetector circuit according to a second embodiment of the invention, and referring to fig. 10, a pixel circuit a is driven by Vdata to make a light emitting layer of a sub-pixel emit light, and an optical signal passes through a PIN layer of a photodetector circuit B, is further converted into an electrical signal, and is transmitted to a driving control module 200 through a lead 01. The embodiment of the present invention is not limited to a specific pixel circuit and a specific photodetector circuit.

As an example, a method of manufacturing the display panel 100 including the photodetection device 30 is briefly provided.

S1, providing a transparent substrate: kangning or Asahi glass, quartz glass, etc. 50-1000um thick; and depositing metal on the transparent substrate by sputtering equipment, wherein the thickness of the metal is 50-200nm, such as Al, Mo, Cr, Ti and the like.

And S2, coating the photoresist, carrying out photoetching and wet etching patterning through an exposure machine after the photoresist is coated, and stripping the photoresist on the metal surface to obtain the pattern of the TFT light shielding layer.

S3, depositing a buffer layer by CVD (chemical vapor deposition), wherein the buffer layer may be SiO 2.

And S4, depositing an oxide on the buffer layer by using a sputter device as an active layer, and carrying out photoetching and wet etching patterning to strip the photoresist on the metal surface, wherein the oxide can be amorphous oxides such as IGZO, ZnON, ITZO and the like.

And S5, depositing a gate insulating layer, namely a GI layer for short, by adopting a CVD method.

S6, depositing a gate metal layer with a thickness of 200-1000nm on the gate insulating layer by using a sputter device, coating a photoresist on the gate insulating layer made of materials such as Al, Mo, Cr, Cu, Ti and the like, and defining a gate pattern by a photoetching process.

And S7, after the gate pattern is defined through the wet etching process, the photoresist is kept from being stripped, and the GI pattern is etched by continuously taking the photoresist on the gate metal layer as a mask.

And S8, conducting the active layer exposed outside by adopting any one of NH3, N2 and H2 to reduce the ohmic contact resistance with the source and drain electrodes.

And S9, depositing an ILD layer (interlayer dielectric layer) by adopting a PECVD (plasma enhanced chemical vapor deposition) method. The ILD layer is a single-layer or multi-layer film, and the material can be SiNx or SiOx.

And S10, obtaining contact via holes of the source and drain electrodes and the active layer through a dry etching process, and obtaining via holes for connecting the source and drain electrodes and the TFT shading layer.

S11, depositing source and drain electrode materials by a sputter process, wherein the materials can be Al, Mo, Cr, Cu, Ti and the like, the thickness is 200-1000nm, and obtaining source and drain electrode patterns through photoetching and wet etching processes, wherein the source and drain electrode patterns comprise a drain electrode, a source electrode, a Data signal line, a Vdd wiring and the like.

S12, depositing a PVX layer (passivation layer) by a PECVD method, wherein the PVX layer (passivation layer) is formed by overlapping one or more of SiNx, SiOx or SiOxNy and has the thickness of 100-500 nm.

S13, coating a color film layer, defining a color film pattern through a photoetching process, and sequentially manufacturing a blue color film layer, a green color film layer, a red color film layer and a planarization layer pattern 1101; and coating photoresist, and obtaining an anode via hole pattern on the PVX layer through exposure and dry etching processes.

S14, depositing an anode material by a sputter process, wherein the material can be ITO with the thickness of 200-1000nm, and obtaining an anode pattern by exposure and wet etching processes.

S15, preparing a PDL layer (pixel defining layer) by a patterning process.

S16, depositing an EL layer (light-emitting layer).

And S17, depositing the cathode by adopting a sputter process or an evaporation process, wherein the cathode needs to ensure a certain transmittance so that the photoelectric detector can penetrate through the cathode to detect the difference of the light intensity of each sub-pixel, particularly the boundary pixel position coordinates of the bright pixel and the dark pixel.

S18, depositing a Thin film encapsulation layer (TFE) by using a CVD process.

S19, attaching the photoelectric sensor to the cover plate glass, and accurately aligning the sub-pixels according to the coordinates of the sub-pixels during attachment to achieve accurate alignment of the pixels. And subsequently, the output of the photoelectric sensor is bound with the drive control module.

It is understood that the above-mentioned manufacturing method and the display panel manufactured by the above-mentioned manufacturing method are only one alternative embodiment of the display panel, and do not limit the present invention. In practical applications, the display panel may further include an auxiliary electrode and other structures, and the embodiment of the present invention is not limited in particular.

Optionally, the target frame is a next frame, and the driving control module is specifically configured to:

determining a data signal voltage of each of the sub-pixels in the next frame;

Optionally, the drive control module is specifically configured to:

An example of a display device including a photodetection device is specifically provided below, and it is to be understood that the display device is merely an example and does not limit the present invention. Referring to fig. 11, a display panel in the display device includes sub-pixels, oxide thin film transistors, and photoelectric detection devices disposed in one-to-one correspondence with the sub-pixels, the display panel is connected to a driving IC, the photoelectric detection devices are connected to a detection IC, photocurrents detected by the photoelectric detection devices are sent to a driving control module 30 through the detection IC, and the driving control module 30 may specifically include a display control module, a photoelectric detection control module, and a processor. After the driving control module 30 determines the compensation range through the processor, Vdata required for compensation may be input to the display panel through the driving IC, thereby solving the image sticking problem.

It should be noted that the focus of each embodiment is on the differences from the other embodiments, and the same and similar parts between the embodiments can be referred to each other.

In the embodiment of the present invention, the driving control module in the display device may first determine, from the plurality of sub-pixels, a first sub-pixel with a gray scale of non-0 in the target frame, that is, a lit pixel, where the target frame is a current frame or a next frame, and then determine, in an area range including the first sub-pixel, a second sub-pixel with a gray scale of 0 in the target frame, that is, an unlit pixel affected by an NBTIS effect generated by the lit pixel, so as to adjust a data signal voltage of the second sub-pixel in the target frame from a negative value to a smaller positive value, so as to perform driving compensation on the unlit pixel in a certain range around the lit pixel, thereby avoiding a negative drift of an oxide thin film transistor corresponding to the unlit pixel under the NBTIS effect, and improving a problem of a residual image in the display process.

While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the illustrated ordering of acts, as some steps may occur in other orders or concurrently with other steps in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.

The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above detailed description is provided for the pixel driving method and the display device provided by the present invention, and the principle and the implementation of the present invention are explained in the present document by applying specific examples, and the above description of the embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A pixel driving method is applied to a display device, the display device comprises a plurality of sub-pixels, and oxide thin film transistors used for driving the sub-pixels are correspondingly arranged on the sub-pixels, and the method comprises the following steps:

2. The method according to claim 1, wherein before determining a second sub-pixel having a gray level of 0 in the target frame in a region including the first sub-pixel, further comprising:

3. The method according to claim 1, wherein before determining a second sub-pixel having a gray level of 0 in the target frame in a region including the first sub-pixel, further comprising:

4. The method of claim 1, wherein the target frame is a current frame, and wherein determining a first sub-pixel having a gray level other than 0 in the target frame from the plurality of sub-pixels comprises:

performing photocurrent detection on each sub-pixel in the current frame;

5. The method according to claim 4, wherein the determining a second sub-pixel having a gray level of 0 in the target frame in the region including the first sub-pixel comprises:

6. The method of claim 1, wherein the target frame is a next frame, and wherein determining a first sub-pixel having a gray level other than 0 in the target frame from the plurality of sub-pixels comprises:

determining a data signal voltage of each of the sub-pixels in the next frame;

7. The method of claim 6, wherein determining a second sub-pixel having a gray level of 0 in the target frame within a region including the first sub-pixel comprises:

8. The method of claim 6, wherein said determining the data signal voltage of each of said sub-pixels in said next frame comprises:

9. A display device, comprising a plurality of sub-pixels, wherein the sub-pixels are correspondingly provided with oxide thin film transistors for driving the sub-pixels, and further comprising a driving control module configured to:

10. The display device according to claim 9, further comprising a photodetector disposed in one-to-one correspondence with the sub-pixels, the photodetector being disposed in a light-emitting direction of the corresponding sub-pixel, the photodetector being connected to the drive control module;