CN113053310B

CN113053310B - Gamma adjusting method and device for display panel and display equipment

Info

Publication number: CN113053310B
Application number: CN202110304169.6A
Authority: CN
Inventors: 向东; 胡凤章; 张金泉
Original assignee: Kunshan Govisionox Optoelectronics Co Ltd
Current assignee: Kunshan Govisionox Optoelectronics Co Ltd
Priority date: 2019-01-31
Filing date: 2019-01-31
Publication date: 2022-04-01
Anticipated expiration: 2039-01-31
Also published as: CN111192554B; CN111192554A; CN113053310A

Abstract

The invention relates to a gamma adjusting method and device of a display panel and display equipment, wherein the method comprises the following steps: adjusting the input voltage of the data line of the second pixel of the transparent display area to the current gamma voltage of the current gray scale tie point; acquiring the back light-emitting brightness of the transparent display area; obtaining target back light brightness according to the first corresponding relation between the back light brightness and the gray scale; aiming at the current gray scale binding point, when the back light brightness is the target back light brightness, the front light brightness of the transparent display area is consistent with the light brightness of the non-transparent display area; and determining an adjusting step length according to the comparison result of the back light-emitting brightness and the target back light-emitting brightness so as to adjust the data line input voltage of the second pixel, and determining the data line input voltage when the back light-emitting brightness of the transparent display area is the target back light-emitting brightness as the target gamma voltage of the current gray scale binding point. The embodiment of the invention can reduce the brightness difference between the transparent display area and the non-transparent display area.

Description

Gamma adjusting method and device for display panel and display equipment

Technical Field

The invention relates to the technical field of OLED display equipment, in particular to a gamma adjusting method and device of a display panel and display equipment.

Background

In the related art, the brightness perceived by human eyes is not linearly related to the actual display brightness of the display panel. In low brightness environments, the human eye is more sensitive to changes in brightness, and in high brightness environments, the other way around. This characteristic of the human eye is called Gamma (Gamma) characteristic. Due to the non-linear perception characteristic of human eyes to the brightness, if people need to obtain the brightness feeling with uniform change, the brightness displayed by the display panel needs to be non-uniformly changed so as to adapt to the Gamma characteristic of human eyes. The non-linear parameter of the brightness and the gray scale degree of the display panel can be called as a Gamma parameter, and a curve drawn according to the Gamma parameter is called as a Gamma curve. The Gamma parameter describes the non-linear relationship between the luminance and the gray scale, i.e. the non-linear relationship between the luminance and the input voltage of the data line. Therefore, if the luminance of the display panel and the input voltage of the data line do not conform to the above-mentioned Gamma curve, Gamma correction is required to be performed on the display panel.

Disclosure of Invention

The invention provides a gamma adjusting method and device of a display panel and a display device, aiming at solving the defects in the related art.

According to a first aspect of the embodiments of the present invention, there is provided a gamma adjustment method for a display panel, which is applied to a display panel before factory shipment, where the display panel includes a transparent display area and a non-transparent display area; the method comprises the following steps:

performing gamma adjustment according to a target gamma curve and the sampling values of the optical parameters of the first pixel in the non-transparent display area to obtain a first curve indicating the relation between the absolute value of the input voltage of the data line of the first pixel and the gray scale, and storing the data of the first curve in a display driving chip of the display panel;

aiming at each gray scale binding point of the transparent display area, obtaining a data line input voltage corresponding to the gray scale binding point according to the gray scale binding point and the first curve, and using the data line input voltage as a reference data line input voltage of a second pixel in the transparent display area;

adjusting the data line input voltage of the second pixel to the reference data line input voltage, and acquiring a sampling value of an optical parameter of the second pixel;

adjusting the data line input voltage of the second pixel according to the comparison result between the sampling value of the optical parameter of the second pixel and the target value, and determining the data line input voltage of the second pixel as the gamma voltage when the sampling value of the optical parameter of the second pixel is substantially the target value; the target value is determined according to the gray scale binding point and the target gamma curve;

and obtaining a second curve indicating the relation between the absolute value of the input voltage of the data line of the second pixel and the gray scale according to each gray scale binding point of the transparent display area and the corresponding gamma voltage, and storing the data of the second curve and the area coordinate of the transparent display area in the display driving chip in a correlation manner.

In one embodiment, the adjusting the data line input voltage of the second pixel according to the comparison result between the sampled value of the optical parameter of the second pixel and the target value includes:

determining a first target adjustment step size according to a comparison result between the sampled value of the optical parameter of the second pixel and the target value;

and adjusting the input voltage of the data line of the second pixel according to the first target adjustment step length.

In this embodiment, by comparing the sampled value of the optical parameter of the second pixel with the target value, it is possible to determine a first target adjustment step size according to the comparison result, and adjust the data line input voltage of the second pixel according to the first target adjustment step size. In this way, an appropriate adjustment step size can be determined, and the problem that the adjustment time length is long due to the fact that the adjustment step size is not appropriate is avoided.

In one embodiment, the determining a first target adjustment step size according to a comparison result between the sampled value of the optical parameter of the second pixel and the target value comprises:

acquiring an absolute value of a difference value between the sampling value of the optical parameter of the second pixel and the target value to obtain a first absolute value;

obtaining a ratio between the first absolute value and the target value to obtain a first ratio;

determining a target ratio interval to which the first ratio belongs in at least two preset ratio intervals to obtain a first target ratio interval;

and determining the first target adjusting step length according to the first target ratio interval and the corresponding relation between the preset ratio interval and the adjusting step length.

In this embodiment, by obtaining a first absolute value of a difference between the sampled value of the optical parameter of the second pixel and the target value and a first ratio between the first absolute value and the target value, a deviation degree between the sampled value of the optical parameter of the second pixel and the target value may be determined, then, a first target ratio range to which the first ratio belongs in at least two preset ratio ranges may be determined, levels of the deviation degrees corresponding to each ratio range are different, and then, the first target adjustment step size is determined according to the first target ratio range and a corresponding relationship between the preset ratio range and the adjustment step size. In this way, the corresponding adjustment step size can be determined for the level of the degree of deviation between the sampled value of the optical parameter of the second pixel and the target value, making the adjustment step size moderate.

Preferably, when said first target ratio interval is [ 30%, + ∞), said first target adjustment step has a value of a first step; when the first target ratio interval is (5%, 30%), the value of the first target adjustment step is a second step value, and when the first target ratio interval is [0, 5% ], the value of the first target adjustment step is a third step value, the first step value is greater than the second step value, and the second step value is greater than the third step value.

When the ratio in the first target ratio interval is larger, the value of the corresponding first target adjustment step length is larger, so that when the level of the deviation degree between the sampling value of the optical parameter of the second pixel and the target value is larger, a larger adjustment step length can be adopted, which is beneficial to shortening the adjustment time length. When the ratio in the first target ratio interval is smaller, the value of the corresponding first target adjustment step length is smaller, so that when the level of the deviation degree between the sampling value of the optical parameter of the second pixel and the target value is smaller, a smaller adjustment step length can be adopted, and the adjustment time length is prevented from being longer due to the larger adjustment step length.

In one embodiment, before the performing the gamma adjustment according to the target gamma curve and the sampled value of the optical parameter of the first pixel in the non-transparent display area, the method further includes:

receiving a first setting parameter for setting the optical parameter;

setting the optical parameters according to the first setting parameters.

In this embodiment, the first setting parameter for setting the optical parameter may be received, and the optical parameter may be set according to the first setting parameter, so that the optical parameter for gamma adjustment may be independently set, improving the practicality.

Preferably, the optical parameters comprise luminance and/or color coordinates.

When the optical parameter is brightness, gamma adjustment can be simplified, and the efficiency of gamma adjustment can be improved. When the optical parameters include brightness and color coordinates, the accuracy of gamma adjustment can be improved.

In one embodiment, before obtaining, according to the gray scale binding point and the first curve, a data line input voltage corresponding to the gray scale binding point for each gray scale binding point of the transparent display area, the method further includes:

receiving area coordinates for setting the transparent display area;

and determining the position of the transparent display area according to the area coordinates.

In this embodiment, the area coordinates for setting the transparent display area may be received, and the position of the transparent display area may be determined according to the area coordinates. Therefore, the region coordinates of the transparent display area can be independently set, and the practicability is improved.

In one embodiment, the region coordinates are stored in a Random Access Memory (RAM) of the display driver chip.

Preferably, the first pixel is a pixel of any color in a first pixel unit in the non-transparent display area, the first pixel unit includes pixels of N colors, and N is a positive integer.

The second pixel is a pixel of any color in a second pixel unit in the transparent display area, the second pixel unit comprises pixels of M colors, and M is a positive integer.

According to a second aspect of the embodiments of the present invention, there is provided a gamma adjustment device for a display panel, which is applied to a display panel before factory shipment, the display panel including a transparent display area and a non-transparent display area; the gamma adjusting device comprises:

the first acquisition module is used for carrying out gamma adjustment according to a target gamma curve and a sampling value of an optical parameter of a first pixel in the non-transparent display area to obtain a first curve indicating the relation between the absolute value of the input voltage of the data line of the first pixel and the gray scale;

the first storage module is used for storing the data of the first curve in a display driving chip of the display panel;

a second obtaining module, configured to obtain, for each gray scale binding point of the transparent display area, a data line input voltage corresponding to the gray scale binding point according to the gray scale binding point and the first curve, where the data line input voltage is used as a reference data line input voltage of a second pixel in the transparent display area;

the first adjusting module is used for adjusting the data line input voltage of the second pixel to the reference data line input voltage and acquiring a sampling value of an optical parameter of the second pixel;

a second adjusting module, configured to adjust a data line input voltage of the second pixel according to a comparison result between a sampled value of an optical parameter of the second pixel and a target value, and determine the data line input voltage of the second pixel as a gamma voltage when the sampled value of the optical parameter of the second pixel is substantially the target value; the target value is determined according to the gray scale binding point and the target gamma curve;

the third obtaining module is used for obtaining a second curve indicating the relation between the absolute value of the input voltage of the data line of the second pixel and the gray scale according to each gray scale binding point of the transparent display area and the corresponding gamma voltage;

and the second storage module is used for storing the data of the second curve and the region coordinate of the transparent display area in the display driving chip in a correlation manner.

The beneficial effects of the embodiment of the invention can include: by performing gamma adjustment according to a target gamma curve and sampling values of optical parameters of first pixels in a non-transparent display area, obtaining a first curve indicating the relationship between the absolute value of a data line input voltage of the first pixels and a gray scale, and obtaining a data line input voltage corresponding to a gray scale binding point as a reference data line input voltage of a second pixel in the transparent display area according to the gray scale binding point and the first curve for each gray scale binding point of the transparent display area, although there is a difference in device structure between the first pixel in the non-transparent display area and the second pixel in the transparent display area, the difference between the gamma voltages corresponding to the same gray scale binding point should not be large, and therefore, gamma adjustment time of the transparent display area can be saved with the gamma voltage of the first pixel in the non-transparent display area as a reference, the efficiency of gamma adjustment is improved.

And adjusting the data line input voltage of the second pixel to the reference data line input voltage, acquiring a sampled value of the optical parameter of the second pixel, adjusting the data line input voltage of the second pixel according to a comparison result between the sampled value of the optical parameter of the second pixel and a target value, and determining the data line input voltage of the second pixel as a gamma voltage when the sampled value of the optical parameter of the second pixel is substantially the target value, wherein the target value is determined according to the gray-scale binding point and the target gamma curve. The gamma adjustment is carried out according to the comparison result between the sampling value of the optical parameter of the first pixel in the non-transparent display area and the target value when the gamma adjustment is carried out on the non-transparent display area, so that the gamma voltage of the first pixel and the gamma voltage of the second pixel are possibly different for the same gray scale binding point, and the screen separation phenomenon of the transparent display area and the non-transparent display area caused by the use of the same gamma voltage can be avoided.

And a first curve indicating the relation between the absolute value of the input voltage of the data line of the first pixel and the gray scale and a second curve indicating the relation between the absolute value of the input voltage of the data line of the second pixel and the gray scale are stored in the same display driving chip of the display panel, and the data of the second curve is stored in association with the area coordinate of the transparent display area. Thus, the transparent display area and the non-transparent display area can be driven by using the same display driving chip.

According to a third aspect of the embodiments of the present invention, there is provided a gamma adjustment method for a display panel, which is applied to a display panel after factory shipment, the display panel includes a transparent display area and a non-transparent display area, the transparent display area is a dual-sided light emitting display area, a front surface of the transparent display area is a surface facing ambient light, and a back surface of the transparent display area is a surface facing away from the ambient light, the gamma adjustment method includes:

adjusting the data line input voltage of the second pixel of the transparent display area to be the current gamma voltage of the current gray scale tie point;

acquiring the current back light brightness of the transparent display area;

obtaining corresponding target back light brightness according to the current back light brightness and a first prestored corresponding relation between the back light brightness and the gray scale of the transparent display area; aiming at the current gray scale binding point, when the back light-emitting brightness of the transparent display area is the target back light-emitting brightness, the front light-emitting brightness of the transparent display area is basically consistent with the light-emitting brightness of the non-transparent display area;

determining a second target adjustment step length according to the comparison result of the current back light-emitting brightness and the target back light-emitting brightness;

and adjusting the data line input voltage of the second pixel according to the second target adjustment step length, and determining the data line input voltage when the back light emitting brightness of the transparent display area is basically the target back light emitting brightness as the target gamma voltage of the current gray scale binding point.

In one embodiment, the determining a second target adjustment step according to the comparison result between the current back light-emitting brightness and the target back light-emitting brightness includes:

acquiring an absolute value of a difference value between the current back light-emitting brightness and the target back light-emitting brightness to obtain a second absolute value;

obtaining a ratio between the second absolute value and the target back light brightness to obtain a second ratio;

determining a target ratio interval to which the second ratio belongs in at least two preset ratio intervals to obtain a second target ratio interval;

and determining the second target adjusting step length according to the second target ratio interval and the corresponding relation between the preset ratio interval and the adjusting step length.

In this embodiment, by obtaining the second absolute value of the difference between the current back light-emission luminance and the target back light-emission luminance and the second ratio between the second absolute value and the target back light-emission luminance, the degree of deviation between the current back light-emission luminance and the target back light-emission luminance may be determined, then, a second target ratio interval to which the second ratio belongs in at least two preset ratio intervals may be determined, the degree of deviation corresponding to each ratio interval is different, and then, the second target adjustment step length is determined according to the second target ratio interval and the corresponding relationship between the preset ratio interval and the adjustment step length. Thus, the corresponding adjusting step length can be determined according to the grade of the deviation degree between the current back light emitting brightness and the target back light emitting brightness, and the adjusting step length is moderate.

Preferably, when said second target ratio interval is [ 30%, + ∞), the value of said second target adjustment step is the first step value; when the second target ratio interval is (5%, 30% >), the value of the second target adjustment step is a second step value, and when the second target ratio interval is [0, 5% ], the value of the second target adjustment step is a third step value, the first step value is greater than the second step value, and the second step value is greater than the third step value.

In this embodiment, when the ratio in the second target ratio interval is larger, the value of the corresponding second target adjustment step size is larger, so that when the level of the deviation degree between the current back light emission luminance and the target back light emission luminance is larger, a larger adjustment step size may be adopted, which is beneficial to shortening the adjustment duration. When the ratio in the second target ratio interval is smaller, the value of the corresponding second target adjustment step size is smaller, so that when the grade of the deviation degree between the current back light brightness and the target back light brightness is smaller, a smaller adjustment step size can be adopted, and the problem that the adjustment time length is longer due to the fact that the adjustment step size is larger is avoided.

In one embodiment, when the current gray-scale binding point is located in a low gray-scale binding point interval, after the determining that the data line input voltage at which the back light-emitting brightness of the transparent display area is substantially the target back light-emitting brightness is the target gamma voltage of the current gray-scale binding point, the method further includes:

detecting whether the absolute value of the target gamma voltage is smaller than the absolute value of the target gamma voltage corresponding to the previous gray scale binding point; if so, acquiring absolute values of target gamma voltages corresponding to at least two gray scale binding points before the current gray scale binding point; the gray scale of the previous gray scale binding point and the gray scales of the at least two gray scale binding points are respectively larger than the gray scale of the current gray scale binding point;

fitting according to the absolute values of the target gamma voltages of the at least two gray scale binding points to obtain a fourth relation curve of the gray scale and the absolute value of the gamma voltage;

and adjusting the target gamma voltage according to the gray scale of the current gray scale binding point and the fourth relation curve so as to enable the absolute value of the adjusted target gamma voltage to be positioned on the fourth relation curve.

When the current gray scale binding point is located in the low gray scale binding point interval, when the absolute value of the target gamma voltage corresponding to the current gray scale binding point is detected to be smaller than the absolute value of the target gamma voltage corresponding to the previous gray scale binding point, the absolute value of the target gamma voltage corresponding to at least two gray scale binding points in front of the current gray scale binding point can be obtained, a fourth relation curve of the absolute values of the gray scales and the gamma voltages is obtained according to the absolute value fitting of the target gamma voltages of the at least two gray scale binding points, then, the target gamma voltage of the current gray scale binding point is adjusted according to the gray scale of the current gray scale binding point and the fourth relation curve, and the absolute value of the target gamma voltage of the adjusted current gray scale binding point is located on the fourth relation curve. Since the gamma voltages of all the gray scale bindings of the same display panel are consistent according to the variation trend of the gray scale bindings in the same arrangement direction, the absolute value of the target gamma voltage corresponding to the current gray scale binding point should be actually located on or close to the fourth relationship curve. Therefore, the absolute value of the target gamma voltage corresponding to the gray scale of the current gray scale binding point on the fourth relationship curve should be the absolute value of the actual gamma voltage corresponding to the gray scale of the current gray scale binding point, or the absolute value of the actual gamma voltage corresponding to the gray scale close to the current gray scale binding point. Therefore, the absolute value of the adjusted target gamma voltage of the current gray scale tie point on the fourth relationship curve is closer to the absolute value of the actual gamma voltage corresponding to the gray scale of the current gray scale tie point. Therefore, the problems of low gray scale black band, bright band or color cast caused by the gamma voltage overturn can be avoided by detecting whether the gamma voltage overturns and correcting in the gamma adjustment process.

In one embodiment, the second pixel is a pixel of any color in a second pixel unit in the transparent display area, the second pixel unit includes pixels of M colors, and M is a positive integer.

According to a fourth aspect of the embodiments of the present invention, there is provided a gamma adjustment device for a display panel, which is applied to a display panel after factory shipment, the display panel includes a transparent display area and a non-transparent display area, the transparent display area is a dual-sided light emitting display area, a front surface of the transparent display area is a surface facing ambient light, and a back surface of the transparent display area is a surface facing away from the ambient light, the gamma adjustment device includes:

the third adjusting module is used for adjusting the input voltage of the data line of the second pixel of the transparent display area to be the current gamma voltage of the current gray scale binding point;

the fourth acquisition module is used for acquiring the current back light brightness of the transparent display area;

the fifth acquisition module is used for acquiring corresponding target back luminous brightness according to the current back luminous brightness and a first pre-stored corresponding relation between the back luminous brightness and the gray scale of the transparent display area; aiming at the current gray scale binding point, when the back light-emitting brightness of the transparent display area is the target back light-emitting brightness, the front light-emitting brightness of the transparent display area is basically consistent with the light-emitting brightness of the non-transparent display area;

the determining module is used for determining a second target adjusting step length according to the comparison result of the current back light brightness and the target back light brightness;

and the fourth adjusting module is used for adjusting the data line input voltage of the second pixel according to the second target adjusting step length, and determining the data line input voltage when the back light emitting brightness of the transparent display area is basically the target back light emitting brightness as the target gamma voltage of the current gray scale tie point.

According to a fifth aspect of embodiments of the present invention, there is provided a display device including: a display panel and a gamma adjusting device of the display panel; the display panel comprises a transparent display area and a non-transparent display area, and a photosensitive element is arranged below the transparent display area.

The embodiment of the invention has the beneficial effects that: after the display panel leaves a factory, the input voltage of the data line of the second pixel of the transparent display area can be adjusted to be the current gamma voltage of the current gray scale tie point, the current back light brightness of the transparent display area is obtained, and then the corresponding target back light brightness is obtained according to the current back light brightness and the prestored first corresponding relation between the back light brightness of the transparent display area and the gray scale, wherein for the same gray scale tie point, when the back light brightness of the transparent display area is the target back light brightness, the front light brightness of the transparent display area is basically consistent with the light brightness of the non-transparent display area. And then, determining a second target adjusting step length according to the comparison result of the current back light-emitting brightness and the target back light-emitting brightness, adjusting the data line input voltage of the second pixel according to the second target adjusting step length, and determining the data line input voltage when the back light-emitting brightness of the transparent display area is basically the target back light-emitting brightness as the target gamma voltage of the current gray scale tie point. Thus, after the gamma voltage of the transparent display area is corrected, the front light-emitting brightness of the transparent display area can be basically consistent with the light-emitting brightness of the non-transparent display area. According to the technical scheme provided by the embodiment of the invention, on the premise of ensuring that the photosensitive element under the transparent display area can receive enough light, the brightness difference between the transparent display area and the non-transparent display area can be reduced or eliminated, so that the display effect is improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a flowchart illustrating a gamma adjustment method of a display panel according to an embodiment of the present invention;

fig. 2 is a flowchart illustrating another gamma adjustment method of a display panel according to an embodiment of the present invention;

fig. 3 is a flowchart illustrating another gamma adjustment method of a display panel according to an embodiment of the present invention;

fig. 4 is a flowchart illustrating another gamma adjustment method of a display panel according to an embodiment of the present invention;

fig. 5 is a flowchart illustrating another gamma adjustment method of a display panel according to an embodiment of the present invention;

fig. 6 is a block diagram illustrating a gamma adjustment apparatus of another display panel according to an embodiment of the present invention;

FIG. 7 is a top view of a display panel according to an embodiment of the present invention;

fig. 8 is a schematic view illustrating light emission of a transparent display region and a non-transparent display region according to an embodiment of the present invention, wherein the cross-sectional view corresponds to the AA line in fig. 7;

fig. 9 is a flowchart illustrating a gamma adjustment method of a display panel according to an embodiment of the present invention;

fig. 10 is a flowchart illustrating a gamma adjustment method of another display panel according to an embodiment of the present invention;

fig. 11 is a flowchart illustrating a gamma adjustment method of another display panel according to an embodiment of the present invention;

FIG. 12 is a diagram illustrating a relationship between gray scale and gamma voltage according to an embodiment of the present invention;

FIG. 13 is a schematic diagram illustrating another relationship between gray scale and gamma voltage according to an embodiment of the present invention;

fig. 14 is a block diagram illustrating a gamma adjustment device of another display panel according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.

In the related art, there is a full-screen including a transparent display area and a non-transparent display area, and the transparent display area can implement both a light transmission function and a display function. However, since the transparent display region has a high requirement for transmittance, the second pixel structure and material in the transparent display region may be different from those of the first pixels in the non-transparent display region. If the same gamma voltage is used for the same gray scale, the brightness of the transparent display area is inconsistent with that of the non-transparent display area, and the phenomenon of screen splitting is caused.

In order to solve the foregoing technical problems, embodiments of the present invention provide a gamma adjustment method and an adjustment device for a display panel, and a display device, which can reduce or avoid the phenomenon of screen separation between a transparent display area and a non-transparent display area.

The embodiment of the invention provides a gamma adjusting method of a display panel, which is applied to the display panel before delivery. The display panel comprises a transparent display area and a non-transparent display area. As shown in FIG. 1, the gamma adjustment method may include the following steps 101-105:

in step 101, gamma adjustment is performed according to a target gamma curve and sampling values of optical parameters of a first pixel in the non-transparent display area, a first curve indicating a relationship between an absolute value of a data line input voltage of the first pixel and a gray scale is obtained, and data of the first curve is stored in a display driving chip of the display panel.

In one embodiment, the display panel is a small-sized display panel, for example, a display panel of a small-sized display device such as a mobile phone, a tablet computer, a smart watch, an AR (augmented reality), a VR (virtual reality), and the like. In this embodiment, the display panel drives the second pixels in the transparent display area and the first pixels in the non-transparent display area by using the same display driving chip.

In one embodiment, when gamma-adjusting the display panel, all the second pixels in the transparent display area may be driven to be simultaneously lighted up using the display driving chip, and all the first pixels in the non-transparent display area may be simultaneously lighted up using the display driving chip. And then, carrying out gamma regulation according to a target gamma curve and sampling values of optical parameters of the first pixels in the non-transparent display area to obtain a first curve indicating the relation between the absolute value and the gray scale of the input voltage of the data line of the first pixels, and storing the data of the first curve in a display driving chip of the display panel.

In one embodiment, the specific process of obtaining the first curve indicating the relationship between the absolute value of the input voltage of the data line of the first pixel and the gray scale according to the target gamma curve and the sampled value of the optical parameter of the first pixel in the non-transparent display area by gamma adjustment may be as follows: firstly, a preset number of gray scales can be selected from 0-255 gray scales as gray scale binding points, and a target value of an optical parameter corresponding to each gray scale binding point is obtained according to a target gamma curve. Wherein the target gamma curve may be a gamma curve having a gamma value of 2.2. Then, for each gray scale binding point, performing gamma adjustment according to the sampling value of the optical parameter of the first pixel in the non-transparent display area and the target value of the corresponding optical parameter to obtain a corresponding gamma voltage, and obtaining the absolute value of the data line input voltage of the first pixel according to the gamma voltage. Then, data fitting is carried out according to the preset number of gray scale binding points and absolute values of the input voltages of the data lines of the corresponding first pixels, and a first curve indicating the relation between the absolute values of the input voltages of the data lines of the first pixels and the gray scales can be obtained. The first curve also comprises absolute values of data line input voltages of first pixels corresponding to the rest gray scales except for preset number of gray scale binding points in the 0-255 gray scales.

In one embodiment, in the gray levels of 0 to 255, the absolute value of the input voltage of the data line of the gray level increases with the decrease of the gray level value. In another embodiment, in the gray levels of 0-255, the absolute value of the data line input voltage of the gray level decreases with the decrease of the gray level value.

In step 102, for each gray scale binding point of the transparent display area, according to the gray scale binding point and the first curve, obtaining a data line input voltage corresponding to the gray scale binding point as a reference data line input voltage of a second pixel in the transparent display area.

After the adjustment of the non-transparent display area is completed, the gamma adjustment result of the non-transparent display area can be used as a reference to improve the gamma adjustment efficiency of the transparent display area.

In one embodiment, for each gray scale binding point of the transparent display area, a data line input voltage corresponding to the gray scale binding point may be obtained according to the gray scale binding point and the first curve, and is used as a reference data line input voltage of a second pixel in the transparent display area.

In one embodiment, the pixel unit of the display panel may include pixels of N colors, N being a positive integer. For example, N may be 3, and the pixel unit may include a pixel R of a red color, a pixel G of a green color, and a pixel B of a blue color. The pixels of each color respectively correspond to a set of gamma voltages. When gamma adjustment is performed on the display panel, gamma adjustment may be performed separately for each color pixel. In the embodiment of the present invention, the gamma adjustment of the pixels of one color will be described in detail.

In one embodiment, the first pixel unit of the non-transparent display region may include pixels of N colors, N being a positive integer. The first pixel may be a pixel of any color in a first pixel unit in the non-transparent display region. The second pixel unit of the transparent display region may include pixels of M colors, M being a positive integer. The second pixel is a pixel of any color in a second pixel unit in the transparent display area. For example, the first pixel unit may include a pixel R of a red color, a pixel G of a green color, and a pixel B of a blue color. The first pixels of each color respectively correspond to a set of gamma voltages. I.e. the first pixels of each color correspond to one first curve each. When gamma adjustment is performed on the display panel, gamma adjustment may be performed separately for each color pixel. In the embodiment of the present invention, the gamma adjustment of the pixels of one color will be described in detail.

In step 103, the data line input voltage of the second pixel is adjusted to the reference data line input voltage, and a sampled value of the optical parameter of the second pixel is obtained.

In one embodiment, the sampled value of the optical parameter of the second pixel may be acquired by placing an optical measurement instrument on the transparent display area.

In one embodiment, the optical parameter may be brightness. Thus, the gamma adjustment can be simplified, and the efficiency of the gamma adjustment can be improved.

In another embodiment, the optical parameters may be luminance and color coordinates. In this way, the accuracy of gamma adjustment can be improved.

In step 104, adjusting the data line input voltage of the second pixel according to the comparison result between the sampling value of the optical parameter of the second pixel and the target value, and determining the data line input voltage of the second pixel as the gamma voltage when the sampling value of the optical parameter of the second pixel is substantially the target value; the target value is determined according to the gray scale binding point and the target gamma curve.

In one embodiment, the target value of the optical parameter may be determined according to the gray-scale binding point and the target gamma curve, the sampled value of the optical parameter of the second pixel is compared with the target value, the adjustment direction and the adjustment step length are determined according to the comparison result, and then the data line input voltage of the second pixel is adjusted according to the adjustment direction and the adjustment step length, so that the sampled value of the optical parameter of the second pixel approaches the target value. Then, the data line input voltage of the second pixel when the sampling value of the optical parameter of the second pixel is substantially the target value is determined as the gamma voltage. Wherein the sampling value of the optical parameter of the second pixel being substantially the target value comprises two cases: one is that the sampled value of the optical parameter of the second pixel is the target value, and the other is that the absolute value of the difference between the sampled value of the optical parameter of the second pixel and the target value is smaller than the specified optical parameter value.

The input voltage of the data line of the second pixel is adjusted according to the comparison result between the sampling value of the optical parameter of the second pixel and the target value, so that the gamma adjustment is more targeted, the time length of the gamma adjustment is favorably shortened, and the efficiency of the gamma adjustment is improved.

The gamma adjustment is carried out according to the comparison result between the sampling value of the optical parameter of the first pixel in the non-transparent display area and the target value when the transparent display area and the non-transparent display area are subjected to gamma adjustment according to the same target gamma curve, and the gamma adjustment is carried out according to the comparison result between the sampling value of the optical parameter of the second pixel in the non-transparent display area and the target value when the non-transparent display area is subjected to gamma adjustment.

In step 105, a second curve indicating a relationship between an absolute value of a data line input voltage of the second pixel and a gray scale is obtained according to each gray scale binding point of the transparent display area and a corresponding gamma voltage, and data of the second curve is stored in the display driver chip in association with an area coordinate of the transparent display area.

In one embodiment, a data fitting may be performed on each gray scale binding point of the transparent display area and an absolute value of a corresponding gamma voltage to obtain a second curve indicating a relationship between the absolute value of the input voltage of the data line of the second pixel and the gray scale. The second curve includes, in addition to the absolute value of the data line input voltage of the second pixel corresponding to the gray scale binding point, the absolute value of the data line input voltage of the second pixel corresponding to the remaining gray scales.

In one embodiment, the data of the second curve may be stored in the display driving chip in association with the area coordinates of the transparent display area. In this way, when the display driving chip drives the second pixel in the transparent display area to light up, the data of the second curve can be searched according to the area coordinate of the transparent display area.

The embodiment of the invention has the beneficial effects that: by performing gamma adjustment according to a target gamma curve and sampling values of optical parameters of first pixels in a non-transparent display area, obtaining a first curve indicating a relationship between an absolute value of a data line input voltage of the first pixels and a gray scale, and obtaining, for each gray scale binding point of the transparent display area, a data line input voltage corresponding to the gray scale binding point according to the gray scale binding point and the first curve as a reference data line input voltage of a second pixel in the transparent display area, although there is a difference in device structures of the first pixel in the non-transparent display area and the second pixel in the transparent display area, for the same gray scale binding point, a difference between gamma voltages corresponding to the first pixel and the second pixel in the transparent display area should be small, and therefore, with the gamma voltage of the first pixel in the non-transparent display area as a reference, a time for gamma adjustment of the transparent display area can be saved, the efficiency of gamma adjustment is improved.

And adjusting the data line input voltage of the second pixel to the reference data line input voltage, acquiring a sampled value of the optical parameter of the second pixel, adjusting the data line input voltage of the second pixel according to a comparison result between the sampled value of the optical parameter of the second pixel and a target value determined according to the gray-scale binding point and the target gamma curve, and determining the data line input voltage of the second pixel when the sampled value of the optical parameter of the second pixel is substantially the target value as the gamma voltage. The gamma adjustment is carried out according to the same target gamma curve in the transparent display area and the non-transparent display area, and when the gamma adjustment is carried out on the transparent display area, the gamma adjustment is carried out according to the comparison result between the sampling value of the optical parameter of the second pixel in the transparent display area and the target value, and when the gamma adjustment is carried out on the non-transparent display area, the gamma adjustment is carried out according to the comparison result between the sampling value of the optical parameter of the first pixel in the non-transparent display area and the target value, so that the gamma voltage of the first pixel and the gamma voltage of the second pixel are possibly different for the same gray scale binding point, and the screen separation phenomenon of the transparent display area and the non-transparent display area caused by the same gamma voltage can be avoided.

Fig. 2 is a flowchart illustrating a gamma adjustment method of a display panel according to another exemplary embodiment. In this embodiment, on the basis of the embodiment shown in fig. 1, the step 104 of "adjusting the data line input voltage of the second pixel according to the comparison result between the sampled value of the optical parameter of the second pixel and the target value" may include the following steps 201 to 202:

in step 201, a first target adjustment step is determined based on a comparison between the sampled value of the optical parameter of the second pixel and the target value.

In step 202, the data line input voltage of the second pixel is adjusted according to the first target adjustment step size.

In this embodiment, a first target adjustment step may be determined according to a result of comparison between a sampled value of an optical parameter of the second pixel and the target value, and then a data line input voltage of the second pixel may be adjusted according to the first target adjustment step.

Fig. 3 is a flowchart illustrating a gamma adjustment method of a display panel according to another exemplary embodiment. In this embodiment, on the basis of the embodiment shown in fig. 2, the step 201 may include the following steps 301 to 304:

in step 301, an absolute value of a difference between the sampled value of the optical parameter of the second pixel and the target value is obtained, so as to obtain a first absolute value.

In step 302, a ratio between the first absolute value and the target value is obtained to obtain a first ratio.

In step 303, a target ratio interval to which the first ratio belongs in at least two preset ratio intervals is determined, so as to obtain a first target ratio interval.

In step 304, the first target adjustment step size is determined according to the first target ratio interval and the corresponding relationship between the preset ratio interval and the adjustment step size.

In this embodiment, an absolute value of a difference between the sampling value of the optical parameter of the second pixel and the target value is obtained to obtain a first absolute value, and then a ratio between the first absolute value and the target value is obtained to obtain a first ratio, where the first ratio is used to indicate a degree of deviation of the sampling value of the optical parameter of the second pixel from the target value.

In the present embodiment, three ratio ranges [ 30%, + ∞), (5%, 30% ] and [0, 5%) may be stored in advance. Each ratio interval corresponds to an adjusting step, wherein the adjusting steps corresponding to the ratio intervals [ 30%, + ∞), (5%, 30% ], and [0, 5%) are a first step value, a second step value, and a third step value. Wherein the first step value is greater than the second step value, and the second step value is greater than the third step value.

In this embodiment, a target ratio interval to which the first ratio belongs may be determined, a first target ratio interval is obtained, and the first target adjustment step length is determined according to the first target ratio interval and a corresponding relationship between a preset ratio interval and an adjustment step length. The value of the first target adjustment step is the first step value when the first target ratio interval is [ 30%, + ∞). The value of the first target adjustment step is the second step value when the first target ratio interval is (5%, 30% ]. the value of the first target adjustment step is the third step value when the first target ratio interval is [0, 5%). For example, when the first ratio is 40%, the ratio interval to which the first ratio belongs is [ 30%, + ∞), i.e., the first target ratio interval is [ 30%, + ∞), then the first target adjustment step is the first step value.

Fig. 4 is a flowchart illustrating a gamma adjustment method of a display panel according to another exemplary embodiment. In this embodiment, on the basis of the embodiment shown in fig. 1, before the step 101, the following steps 401 to 402 may be further included:

in step 401, a first setting parameter for setting the optical parameter is received.

In step 402, the optical parameters are set according to the first setting parameters.

In this embodiment, a first setting parameter for setting an optical parameter may be received, and the optical parameter may be set according to the first setting parameter.

In one embodiment, the optical parameter may be luminance when adjustment according to light emitting luminance of a pixel of the display panel is required.

In another embodiment, the optical parameters may include luminance and color coordinates when gamma adjustment according to the light emission luminance and the color coordinates of the pixels of the display panel is required.

Of course, when gamma adjustment according to color coordinates of light emission of pixels of the display panel is required, the optical parameters may include the color coordinates.

Fig. 5 is a flowchart illustrating a gamma adjustment method of a display panel according to another exemplary embodiment. In this embodiment, on the basis of the embodiment shown in fig. 1, before the step 101, the following steps 501 to 502 may be further included:

in step 501, region coordinates for setting the transparent display area are received.

In step 502, the position of the transparent display area is determined according to the area coordinates.

In this embodiment, the area coordinates for setting the transparent display area may be received, and the position of the transparent display area may be determined according to the area coordinates.

Preferably, the region coordinates are stored in a Random Access Memory (RAM) of the display driving chip.

The embodiment of the invention also provides a gamma adjusting device of a display panel, which is applied to the display panel before leaving a factory, wherein the display panel comprises a transparent display area and a non-transparent display area; as shown in fig. 6, the gamma adjusting device includes:

a first obtaining module 601, configured to perform gamma adjustment according to a target gamma curve and a sampling value of an optical parameter of a first pixel in the non-transparent display area, to obtain a first curve indicating a relationship between an absolute value of a data line input voltage of the first pixel and a gray scale;

a first saving module 602, configured to save the data of the first curve in a display driver chip of the display panel;

a second obtaining module 603, configured to obtain, for each gray scale binding point of the transparent display area, a data line input voltage corresponding to the gray scale binding point according to the gray scale binding point and the first curve, where the data line input voltage is used as a reference data line input voltage of a second pixel in the transparent display area;

a first adjusting module 604, configured to adjust a data line input voltage of the second pixel to the reference data line input voltage, and obtain a sampling value of an optical parameter of the second pixel;

a second adjusting module 605, configured to adjust the data line input voltage of the second pixel according to a comparison result between the sampled value of the optical parameter of the second pixel and a target value, and determine the data line input voltage of the second pixel as the gamma voltage when the sampled value of the optical parameter of the second pixel is substantially the target value; the target value is determined according to the gray scale binding point and the target gamma curve;

a third obtaining module 606, configured to obtain a second curve indicating a relationship between an absolute value of the data line input voltage of the second pixel and a gray scale according to each gray scale tie point of the transparent display area and the corresponding gamma voltage;

a second saving module 607, configured to store the data of the second curve in the display driver chip in association with the area coordinate of the transparent display area.

In this embodiment, the gamma adjusting device of the display panel may use the gamma voltage of the first pixel in the non-transparent display area as a reference, so as to save the gamma adjusting time of the transparent display area and improve the gamma adjusting efficiency. Moreover, the screen splitting phenomenon of the transparent display area and the non-transparent display area caused by the same gamma voltage can be avoided. Moreover, the same display driving chip can be used to drive the transparent display area and the non-transparent display area.

An embodiment of the present invention also provides a display device, including: a display panel and a gamma adjusting device of the display panel as shown in FIG. 6; the display panel comprises a transparent display area and a non-transparent display area, and a photosensitive element is arranged below the transparent display area.

The display device in the embodiment of the invention can take the gamma voltage of the first pixel in the non-transparent display area as a reference, thereby saving the time for gamma adjustment of the transparent display area and improving the efficiency of gamma adjustment. Moreover, the split screen phenomenon of the transparent display area and the non-transparent display area caused by the same gamma voltage can be avoided. Moreover, the same display driving chip can be used to drive the transparent display area and the non-transparent display area.

In addition, the embodiment of the invention also provides a gamma adjusting method and device for the factory-shipped full-screen display panel and display equipment. As shown in fig. 7, the full-screen display panel may include a non-transparent display area 71 and a transparent display area 72, the transparent display area 72 is a double-sided light-emitting display area, a front side of the transparent display area 72 is a side facing ambient light, and a back side of the transparent display area is a side facing away from ambient light. Generally, the area of the transparent display area is smaller than the area of the non-transparent display area.

As shown in fig. 7 and 8, in the embodiment of the present invention, a display panel (i.e., a transparent display area 72) is also disposed above the photosensitive element 73, such as a camera and/or a distance sensor, of the display device 7, the area above the photosensitive element 73 of the display device can also display a normal picture together with the non-transparent display area 71 through the transparent display area 72, and when the photosensitive element 73 operates, the transparent display area 72 may not display a picture, but normally transmit light, so as to ensure the realization of the photosensitive function. It should be noted that, for the transparent display area and the non-transparent display area of the display panel shown in fig. 7 and 8, the debugging method disclosed in each of the above embodiments can be used for debugging in the gamma debugging process before shipment. Preferably, before shipping, the gamma debugging process is performed on the transparent display area and the non-transparent display area respectively, so that the initial brightness, chromaticity and the like of the 2 display areas after shipping are kept basically consistent.

Based on the display panel in the embodiment of the present invention, since the transparent display area 72 is a double-sided light emitting display, and the non-transparent display area 71 is a single-sided light emitting area, so that the attenuation speeds of the light emitting materials in the two areas are different, that is, after the display panel operates for a period of time, the luminance of the transparent display area 72 is gradually lower than the luminance of the non-transparent display area 71, which causes the luminance of the two areas to be non-uniform, and therefore, the luminance of the transparent display area 72 needs to be adjusted to ensure the display effect of the full-sided screen.

Based on this, the embodiments of the present invention provide a gamma adjustment method for a display panel, which is applied to a display panel after factory shipment, or in other words, can be applied to a display device including a display panel, and a program for gamma adjustment is installed on the display device. As shown in fig. 9, the gamma adjustment method includes the following steps 901 to 905:

in step 901, the data line input voltage of the second pixel of the transparent display area is adjusted to the current gamma voltage of the current gray scale tie point.

In the related art, a set of gamma voltage data of the transparent display area 72 is pre-stored in a gamma register of the display panel before the display panel leaves a factory, and the gamma voltage data includes gamma voltages (data line input voltages of the second pixels) corresponding to 0 to 255 gray scales. In the present embodiment, the example that a set of gamma voltage data of the transparent display area 72 is stored in the form of the second curve is described. Each point on the second curve corresponds to a gamma voltage of a gray scale, or an absolute value of the gamma voltage.

Of course, a set of gamma voltage data of the non-transparent display area 71 may be pre-stored in the gamma register of the display panel before shipment, and the gamma voltage data set also includes gamma voltages (data line input voltages of the first pixels) corresponding to respective gray scales of 0 to 255. Of course, a set of gamma voltage data of the non-transparent display area 71 may be stored in the form of a first curve. Each point on the first curve corresponds to a gamma voltage of a gray scale, or an absolute value of the gamma voltage.

In one embodiment, the display panel may perform gamma adjustment on the transparent display area 72 according to a preset time period, or may perform gamma adjustment when receiving a control command to start gamma adjustment. The control instruction can be generated according to input operation of a user.

When the gamma adjustment is performed on the transparent display area 72, one gray scale binding point can be selected from the gray scale binding point set of the transparent display area 72 as a current gray scale binding point, the current gamma voltage of the current gray scale binding point in the current state is determined according to the gray scale value of the current gray scale binding point and the second curve, and then the data line input voltage of the pixel of the transparent display area is adjusted to the current gamma voltage of the current gray scale binding point to drive the second pixel to emit light.

Preferably, the second pixel is a pixel of any color in a second pixel unit in the transparent display area, the second pixel unit includes pixels of M colors, and M is a positive integer. For example, the second pixel unit may include a pixel R of a red color, a pixel G of a green color, and a pixel B of a blue color. The second pixels of each color respectively correspond to a set of gamma voltages. I.e. the second pixels of each color each correspond to a second curve. When gamma adjustment is performed on the display panel, gamma adjustment may be performed separately for each color pixel. In the embodiment of the present invention, the gamma adjustment of the pixels of one color will be described in detail.

In step 902, the current back light brightness of the transparent display area is obtained.

In the present embodiment, the current back light emission luminance of the transparent display region may be obtained by the photosensitive element 73 located under the display panel of the transparent display region. Here, the photosensitive element 73 may be a camera.

In step 903, obtaining a corresponding target back light emission brightness according to the current back light emission brightness and a first pre-stored correspondence relationship between the back light emission brightness and the gray scale of the transparent display area; and aiming at the current gray scale binding point, when the back light-emitting brightness of the transparent display area is the target back light-emitting brightness, the front light-emitting brightness of the transparent display area is basically consistent with the non-transparent display area.

In this embodiment, a gamma register of the display panel may store a first corresponding relationship between the backlight luminance of the transparent display area and the gray scale in advance, and the display device may obtain a corresponding target backlight luminance according to the current backlight luminance and the first corresponding relationship. And for the same current gray scale binding point, when the back light-emitting brightness of the transparent display area is the target back light-emitting brightness, the front light-emitting brightness of the transparent display area is basically consistent with the light-emitting brightness of the non-transparent display area.

In step 904, a second target adjustment step is determined according to the comparison result between the current back light emitting brightness and the target back light emitting brightness.

In this embodiment, the display device may determine the second target adjustment step size according to the comparison result by comparing the current back light emission luminance with the target back light emission luminance. Therefore, the appropriate adjusting step length can be determined, and the problem that the adjusting time length is long due to improper adjusting step length is avoided.

In step 905, the data line input voltage of the second pixel is adjusted according to the second target adjustment step, and the data line input voltage when the back light emitting brightness of the transparent display area is substantially the target back light emitting brightness is determined as the target gamma voltage of the current gray scale tie point.

In this embodiment, the display device may adjust the data line input voltage of the second pixel according to a second target adjustment step length, so that the back light emission luminance of the transparent display area gradually approaches the target back light emission luminance, and when the back light emission luminance of the transparent display area is substantially the target back light emission luminance, determine the data line input voltage as the target gamma voltage of the current gray scale binding point.

The beneficial effects of the embodiment of the invention can include: after the display panel leaves a factory, the input voltage of the data line of the second pixel of the transparent display area can be adjusted to be the current gamma voltage of the current gray scale binding point, the current back light emitting brightness of the transparent display area is obtained, and then the corresponding target back light emitting brightness is obtained according to the current back light emitting brightness and the pre-stored first corresponding relation between the back light emitting brightness of the transparent display area and the gray scale, wherein for the same gray scale binding point, when the back light emitting brightness of the transparent display area is the target back light emitting brightness, the front light emitting brightness of the transparent display area is basically consistent with the light emitting brightness of the non-transparent display area. And then, determining a second target adjusting step length according to the comparison result of the current back light brightness and the target back light brightness, adjusting the data line input voltage of the second pixel according to the second target adjusting step length, and determining the data line input voltage when the back light brightness of the transparent display area is basically the target back light brightness as the target gamma voltage of the current gray scale binding point. Thus, after the gamma voltage of the transparent display area is corrected, the front light-emitting brightness of the transparent display area can be basically consistent with the light-emitting brightness of the non-transparent display area. According to the technical scheme provided by the embodiment of the invention, on the premise of ensuring that the photosensitive element under the transparent display area can receive enough light, the brightness difference between the transparent display area and the non-transparent display area can be reduced or eliminated, so that the display effect is improved.

Fig. 10 is a flowchart illustrating a gamma adjustment method of a display panel according to another exemplary embodiment. In this embodiment, on the basis of the embodiment shown in fig. 9, the step 904 may include the following steps 1001 to 1004:

in step 1001, an absolute value of a difference between the current back-side light-emission luminance and the target back-side light-emission luminance is obtained, and a second absolute value is obtained.

In step 1002, a ratio between the second absolute value and the target back light emission luminance is obtained, so as to obtain a second ratio.

In step 1003, a target ratio interval to which the second ratio belongs is determined in at least two preset ratio intervals, so as to obtain a second target ratio interval.

In step 1004, the second target adjustment step length is determined according to the second target ratio interval and the corresponding relationship between the preset ratio interval and the adjustment step length.

In this embodiment, the display device may obtain a second absolute value of a difference between the current back light emission luminance and the target back light emission luminance, obtain a second ratio between the second absolute value and the target back light emission luminance, determine a second target ratio interval to which the second ratio belongs, and then determine the second target adjustment step size according to the second target ratio interval and a corresponding relationship between a preset ratio interval and an adjustment step size.

The method for determining the second target adjustment step length in this embodiment is similar to the method for determining the first target adjustment step length shown in fig. 3, and is not repeated here.

In this embodiment, the deviation degree between the current back light emission luminance and the target back light emission luminance may be determined by obtaining the second absolute value of the difference between the current back light emission luminance and the target back light emission luminance and the second ratio between the second absolute value and the target back light emission luminance, then, the second target ratio interval to which the second ratio belongs in at least two preset ratio intervals may be determined, the levels of the deviation degrees corresponding to each ratio interval are different, and then, the second target adjustment step size is determined according to the second target ratio interval and the corresponding relationship between the preset ratio interval and the adjustment step size. Thus, the corresponding adjusting step length can be determined according to the grade of the deviation degree between the current back light emitting brightness and the target back light emitting brightness, and the adjusting step length is moderate.

In this embodiment, when the ratio in the second target ratio interval is larger, the value of the corresponding second target adjustment step is larger, so that when the level of the deviation degree between the current back light emission luminance and the target back light emission luminance is larger, a larger adjustment step may be adopted, which is beneficial to shortening the adjustment duration. When the ratio in the second target ratio interval is smaller, the value of the corresponding second target adjustment step size is smaller, so that when the grade of the deviation degree between the current back light brightness and the target back light brightness is smaller, a smaller adjustment step size can be adopted, and the problem that the adjustment time length is longer due to the fact that the adjustment step size is larger is avoided.

After the display panel is shipped from a factory, in order to reduce the complexity of gamma adjustment, improve the efficiency of gamma adjustment, and make the sensitivity of human eyes to low-gray-scale images (e.g., brightness less than 10 nits) not very strong, the gamma adjustment method shown in fig. 9 or 10 may be used to perform gamma adjustment on high-gray-scale binding points and medium-gray-scale binding points. If the display effect of the low-gray-scale picture needs to be improved, the gamma adjustment method shown in fig. 11 can be used for gamma adjustment of the low-gray-scale binding points.

Fig. 11 is a flowchart illustrating a gamma adjustment method of a display panel according to another exemplary embodiment. In this embodiment, when the current gray-scale binding point is located in the low gray-scale binding point interval, on the basis of the embodiment shown in fig. 9, after the step 905, the following steps 1101 to 1104 may be included:

in step 1101, detecting whether the absolute value of the target gamma voltage is smaller than the absolute value of the target gamma voltage corresponding to the previous gray scale binding point; if yes, go to step 1102.

In one embodiment, the absolute value of the gamma voltage of a gray-scale binding increases as the gray-scale value decreases. When the gamma adjustment is performed on the binding points in the low-gray-scale binding point interval, because the gray scale is small and the brightness is low, the sampling value of the optical parameter obtained by the optical measuring instrument may be inaccurate occasionally, so that the gamma voltage of the gray-scale binding point with the small gray scale is smaller than the gamma voltage of the gray-scale binding point with the large gray scale. In order to avoid the above situation, for the current gray scale binding point in the low gray scale binding point interval, it may be detected whether the absolute value of the target gamma voltage corresponding to the current gray scale binding point is smaller than the absolute value of the target gamma voltage corresponding to the previous gray scale binding point, and if it is detected that the absolute value of the target gamma voltage corresponding to the current gray scale binding point is smaller than the absolute value of the target gamma voltage corresponding to the previous gray scale binding point, step 1102 is executed.

In one exemplary embodiment, the driving transistor is an N-type transistor, and the data line input voltage is a positive voltage. As shown in fig. 12, gamma voltages of gray-scale bindings D5, D4, D3, D2 in the low gray-scale binding interval increase as gray-scale values decrease. However, if it is detected that the gamma voltage of the gray scale binding point D1 is less than the gamma voltage of the gray scale binding point D2, step 1102 is performed in which the gray scale value of the gray scale binding point D1 is less than the gray scale value of the gray scale binding point D2.

In step 1102, obtaining absolute values of target gamma voltages corresponding to at least two gray scale bindings located before the current gray scale binding; the gray scale of the previous gray scale binding point and the gray scales of the at least two gray scale binding points are respectively greater than the gray scale of the current gray scale binding point.

In this step, the absolute values of the target gamma voltages having gray scale values respectively greater than the at least two gray scale binding points of the current gray scale binding may be obtained from the gray scale binding points subjected to gamma adjustment. Wherein, the gray scale value is respectively greater than at least two gray scale binding points bound by the current gray scale and can be sequentially adjacent to the current gray scale. Specifically, the interval between the gray scale binding point with the smaller gray scale among the at least two gray scale binding points and the current gray scale binding point is closer, and the interval between the gray scale binding point with the larger gray scale among the at least two gray scale binding points and the current gray scale binding point is closer.

Continuing with the above exemplary embodiment, the absolute values of the target gamma voltages of the gray-scale bindings D5, D4, D3, D2 may be obtained, and the absolute values of the target gamma voltages of the gray-scale bindings D3, D2 may also be obtained. When the absolute values of the target gamma voltages of the gray scale binding points D3 and D2 are obtained, the gray scale binding points D2 and D3 are sequentially adjacent to the current gray scale binding point D1, the gray scale value of the gray scale binding point D2 is smaller, closer to the current gray scale binding point D1, and the gray scale value of the gray scale binding point D3 is larger, and farther from the current gray scale binding point D1.

In step 1103, a fourth relationship curve of the gray scale and the absolute value of the gamma voltage is obtained according to the fitting of the absolute values of the target gamma voltages of the at least two gray scale tie points.

In this step, data fitting may be performed on the absolute values of the target gamma voltages of the at least two obtained gray scale bindings to obtain a fourth relationship curve between the gray scale and the absolute value of the gamma voltage. In the fourth relationship, each gray-scale value corresponds to an absolute value of the gamma voltage.

In step 1104, the target gamma voltage is adjusted according to the gray scale of the current gray scale tie point and the fourth relationship curve, so that the absolute value of the adjusted target gamma voltage is located on the fourth relationship curve.

In this step, the absolute value of the corresponding target gamma voltage may be obtained by calculation according to the gray scale value of the current gray scale tie point and the fourth relation curve, and the corresponding gamma voltage may be determined according to the obtained absolute value of the target gamma voltage and the type of the driving transistor in the pixel driving circuit of the display panel.

In this step, the target gamma voltage of the current gray scale tie point may be adjusted to the determined target gamma voltage, and an absolute value of the adjusted target gamma voltage of the current gray scale tie point is located on the fourth relationship curve.

Continuing with the above exemplary embodiment, the absolute values of the target gamma voltages of the gray scale bindings D5, D4, D3, D2 may be obtained, and data fitting may be performed on the absolute values of the target gamma voltages of the gray scale bindings D5, D4, D3, D2 to obtain the fourth relationship curve 121. Then, the absolute value of the gamma voltage corresponding to the current gray level binding on the fourth relation 121 can be obtained according to the gray level value of the gray level binding D2 and the fourth relation 121. As shown in fig. 13, the absolute value of the target gamma voltage corresponding to the obtained current gray scale tie point on the fourth relation curve 121 may be the absolute value of the target gamma voltage corresponding to the data point 122.

In this step, the target gamma voltage of the current gray scale tie point may be determined according to the adjusted absolute value of the target gamma voltage of the current gray scale tie point, and stored.

In this embodiment, when the current grayscale binding point is located in the low grayscale binding point interval, when detecting that the absolute value of the target gamma voltage corresponding to the current grayscale binding point is smaller than the absolute value of the target gamma voltage corresponding to the previous grayscale binding point, the absolute value of the target gamma voltage corresponding to at least two grayscale binding points before the current grayscale binding point can be obtained, and according to the fourth relation curve of the absolute values of the target gamma voltages of at least two grayscale binding points, the gray scale of the current grayscale binding point and the fourth relation curve are obtained, then, according to the gray scale of the current grayscale binding point and the fourth relation curve, the target gamma voltage of the current grayscale binding point is adjusted, so that the absolute value of the target gamma voltage of the adjusted current grayscale binding point is located on the fourth relation curve. Since the gamma voltages of all the gray scale bindings on the same display panel are consistent with each other according to the variation trend of the gray scale bindings in the same arrangement direction, the absolute value of the target gamma voltage corresponding to the current gray scale binding should be actually located on or close to the fourth relationship curve. Therefore, the absolute value of the target gamma voltage corresponding to the gray scale of the current gray scale binding point on the fourth relationship curve should be the absolute value of the actual gamma voltage corresponding to the gray scale of the current gray scale binding point, or the absolute value of the actual gamma voltage corresponding to the gray scale close to the current gray scale binding point. Therefore, the absolute value of the adjusted target gamma voltage at the current gray scale tie point on the fourth relationship curve is closer to the absolute value of the actual gamma voltage corresponding to the gray scale of the current gray scale tie point. Therefore, the problems of low gray scale black band, bright band or color cast caused by the gamma voltage overturn can be avoided by detecting whether the gamma voltage overturns and correcting in the gamma adjustment process.

The embodiment of the invention also provides a gamma adjusting device of a display panel, which is applied to the display panel after leaving a factory, wherein the display panel comprises a transparent display area and a non-transparent display area, the transparent display area is a double-sided luminous display area, the front side of the transparent display area is the side facing ambient light, and the back side of the transparent display area is the side deviating from the ambient light. As shown in fig. 14, the gamma adjusting apparatus includes:

a third adjusting module 141, configured to adjust a data line input voltage of a second pixel of the transparent display area to a current gamma voltage of a current gray scale tie point;

a fourth obtaining module 142, configured to obtain the current back-side luminance of the transparent display area;

a fifth obtaining module 143, configured to obtain corresponding target back light emission brightness according to the current back light emission brightness and a first pre-stored correspondence between the back light emission brightness and the gray scale of the transparent display area; aiming at the current gray scale binding point, when the back light-emitting brightness of the transparent display area is the target back light-emitting brightness, the front light-emitting brightness of the transparent display area is basically consistent with the light-emitting brightness of the non-transparent display area;

a determining module 144, configured to determine a second target adjustment step according to a comparison result between the current back light emission brightness and the target back light emission brightness;

and a fourth adjusting module 145, configured to adjust the data line input voltage of the second pixel according to the second target adjusting step, and determine the data line input voltage when the back light emission luminance of the transparent display area is substantially the target back light emission luminance as the target gamma voltage of the current gray scale tie point.

In this embodiment, the gamma adjustment device of the display panel can reduce or eliminate the brightness difference between the transparent display area and the non-transparent display area on the premise of ensuring that the photosensitive element under the transparent display area can receive a sufficient amount of light, thereby improving the display effect.

An embodiment of the present invention further provides a display device, including: a display panel and a gamma adjusting device of the display panel as shown in fig. 14; the display panel comprises a transparent display area and a non-transparent display area, and a photosensitive element is arranged below the transparent display area.

In this embodiment, the display device can reduce or eliminate the brightness difference between the transparent display area and the non-transparent display area on the premise of ensuring that the photosensitive element under the transparent display area can receive a sufficient amount of light, thereby improving the display effect.

The display device in this embodiment may be: any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, a navigator and the like.

It is noted that in the drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. Also, it will be understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element or layer or intervening layers may also be present. In addition, it will be understood that when an element or layer is referred to as being "under" another element or layer, it can be directly under the other element or intervening layers or elements may also be present. In addition, it will also be understood that when a layer or element is referred to as being "between" two layers or elements, it can be the only layer between the two layers or elements, or there can be more than one intermediate layer or element. Like reference numerals refer to like elements throughout.

In the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims

1. The utility model provides a display panel's gamma control method, its characterized in that is applied to the display panel after leaving the factory, display panel includes transparent display area and non-transparent display area, transparent display area is two-sided luminous display area, the front of transparent display area is the one side towards ambient light, and the back is the one side that deviates from ambient light, gamma control method includes:

adjusting the input voltage of the data line of the second pixel of the transparent display area to be the current gamma voltage of the current gray scale binding point;

acquiring the current back light brightness of the transparent display area;

determining a second target adjusting step length according to the comparison result of the current back light brightness and the target back light brightness;

adjusting the data line input voltage of the second pixel according to the second target adjustment step length, and determining the data line input voltage when the back light brightness of the transparent display area is basically the target back light brightness as the target gamma voltage of the current gray scale binding point;

when the current gray scale tie point is located in a low gray scale tie point interval, after determining that the data line input voltage when the back light emitting brightness of the transparent display area is substantially the target back light emitting brightness is the target gamma voltage of the current gray scale tie point, the method further includes:

2. The gamma adjustment method for a display panel according to claim 1, wherein said determining a second target adjustment step according to the comparison result between the current back light emission luminance and the target back light emission luminance comprises:

3. The gamma adjustment method for a display panel according to claim 2, wherein when the second target ratio interval is [ 30%, + ∞), the value of the second target adjustment step is the first step value; when the second target ratio interval is (5%, 30% >), the value of the second target adjustment step is a second step value, and when the second target ratio interval is [0, 5% ], the value of the second target adjustment step is a third step value, the first step value is greater than the second step value, and the second step value is greater than the third step value.

4. The method of claim 1, wherein the second pixel is a pixel of any color in a second pixel unit in the transparent display area, the second pixel unit comprises pixels of M colors, and M is a positive integer.

5. The utility model provides a display panel's gamma adjusting device, its characterized in that is applied to the display panel after leaving the factory, display panel includes transparent display area and non-transparent display area, transparent display area is two-sided luminous display area, the front in transparent display area is the one side towards ambient light, and the back is the one side that deviates from ambient light, gamma adjusting device includes:

the fifth acquisition module is used for acquiring corresponding target back light brightness according to the current back light brightness and a first prestored corresponding relation between the back light brightness and the gray scale of the transparent display area; aiming at the current gray scale binding point, when the back light-emitting brightness of the transparent display area is the target back light-emitting brightness, the front light-emitting brightness of the transparent display area is basically consistent with the light-emitting brightness of the non-transparent display area;

a fourth adjusting module, configured to adjust a data line input voltage of the second pixel according to the second target adjustment step length, and determine the data line input voltage when the back light luminance of the transparent display area is substantially the target back light luminance as the target gamma voltage of the current gray scale tie point;

the gamma adjusting device is also used for determining the data line input voltage when the back light-emitting brightness of the transparent display area is basically the target back light-emitting brightness as the target gamma voltage of the current gray scale binding point when the current gray scale binding point is positioned in a low gray scale binding point interval,

6. A display device, comprising: a display panel and the gamma adjusting device of the display panel of claim 5; the display panel comprises a transparent display area and a non-transparent display area, and a photosensitive element is arranged below the transparent display area.