OLED display screen contrast enhancement method, system and storage medium

Abstract

The present invention relates to the technical field of contrast enhancement, and in particular, to a method, system and storage medium for contrast enhancement of an OLED display screen. The method steps include: obtaining the ambient light surface on the display screen to obtain the ambient light illumination at different positions on the display screen; obtaining the contrast currently set for the display screen, and using this contrast as a reference contrast; calculating the contrast of the display area that the light sensing unit is responsible for according to the reference contrast to obtain the initial ambient light contrast; calculating the contrast of the pixels in the current display area according to the initial ambient light contrast of the nearby display area to obtain the ambient light contrast of the pixels; and performing contrast enhancement processing according to the initial ambient light contrast and the ambient light contrast of the pixels. The present invention monitors the lighting conditions at different positions around the display screen in real time by densely arranging ambient light sensors, and dynamically adjusts the contrast of each display area according to these lighting data.

Description

Technical Field

[0001] The present invention relates to the technical field of contrast enhancement, and in particular to a method, system and storage medium for enhancing the contrast of an OLED display screen. Background Art

[0002] As an advanced display technology, OLED (Organic Light Emitting Diode) screen is widely used in electronic devices due to its excellent picture quality and unique advantages. Let's take a look at some of the outstanding advantages of OLED screen:

[0003] Infinite contrast: OLED screens use the principle of self-luminescence, and each pixel can be independently illuminated or turned off, so it can achieve complete black. This means that on OLED screens, black is very deep, and can achieve true pure black, while the color performance is also more vivid. The greatly improved contrast makes the picture and video content more delicate and realistic, allowing viewers to enjoy a more shocking visual effect.

[0004] Fast response speed: OLED screen can refresh in microseconds, which makes it excellent at displaying moving images. For fast-moving movies, games or animations, OLED screen can effectively reduce blur or afterimage problems and provide a smoother and more fluid visual experience.

[0005] In other words, OLED displays already have an absolute advantage in contrast, but they cannot take advantage of the ability of each pixel to independently adjust the light intensity and quickly respond to adapt to the intensity of ambient light. In other words, under the influence of ambient light, the contrast enhancement of OLED displays still has certain disadvantages.

[0006] To this end, the present invention provides a method, system and storage medium for enhancing the contrast of an OLED display screen. Summary of the invention

[0007] The above-mentioned background technology provides an OLED display contrast enhancement method, system and storage medium, which aims to solve the problem of how to utilize the characteristics of each pixel to independently adjust the light intensity and quickly respond to adapt to changes in ambient light intensity.

[0008] To achieve the above object, one of the objects of the present invention is to provide a method for enhancing the contrast of an OLED display screen, which comprises the following steps:

[0009] S1. Acquire the ambient light surface on the display screen to obtain the ambient light illumination at different positions on the display screen.

[0010] S2. Obtain the contrast of the display screen currently set, and use this contrast as a reference contrast.

[0011] S3, calculating the contrast of the display area of ​​the light sensing unit according to the reference contrast to obtain an initial ambient light contrast;

[0012] S4, calculating the contrast of the pixels in the current display area according to the initial ambient light contrast of the nearby display area to obtain the ambient light contrast of the pixels;

[0013] S5. Perform contrast enhancement processing according to the initial ambient light contrast and the pixel point ambient light contrast.

[0014] As a further improvement of the technical solution, the display screen is provided with a light sensing unit, and the light sensing unit is used in S1 to collect the ambient light illumination of the display area for which it is responsible;

[0015] The display area that each light sensing unit is responsible for corresponds to a number of pixels.

[0016] As a further improvement of the technical solution, the light sensing unit adopts an ambient light sensor, and the ambient light sensor is installed at any position behind the OLED display screen.

[0017] As a further improvement of the technical solution, the arrangement of the ambient light sensor is as follows:

[0018] Horizontal settings,

[0019] Corner: Place a sensor at the upper left corner, upper right corner, lower left corner, and lower right corner of the screen;

[0020] Edges: Place sensors every 5-10 cm along the top and bottom edges of the screen.

[0021] Central area: Place a sensor every 10-20 cm on the horizontal center line of the screen;

[0022] Vertical settings,

[0023] Center: Place a sensor at the center of the left and right sides of the screen;

[0024] Edges: Place sensors every 5-10 cm along the left and right edges of the screen.

[0025] Central area: Place sensors every 10-20 cm on the vertical midline.

[0026] As a further improvement of the technical solution, for edge sensors, each sensor is responsible for a display area with a width of 5 cm and a height of 10 cm. For sensors in the central area, each sensor is responsible for a display area with a width of 10 cm and a height of 10 cm.

[0027] As a further improvement of the technical solution, the arrangement of the ambient light sensor is as follows:

[0028] The sensors are arranged in a rectangular array, with the distance of 5 pixels defined as a unit distance and the distance between two adjacent sensors as 10 unit distances, so that each sensor can fall on a pixel.

[0029] As a further improvement of the present technical solution, after the S3 calculates the initial ambient light contrast, the contrast of the pixel points corresponding to the sensor is enhanced according to the initial ambient light contrast, and the remaining pixel points are enhanced according to the ambient light contrast of their corresponding pixel points.

[0030] As a further improvement of the present technical solution, the calculation formula of the initial ambient light contrast in S3 is as follows:

[0031] ;

[0032] In the formula, is the initial ambient light contrast; is the reference contrast; is the contrast adjustment factor.

[0033] As a further improvement of the technical solution, the calculation formula of the pixel ambient light contrast in S4 is as follows:

[0034] ;

[0035] In the formula, is the ambient light contrast of the pixel; It's a pixel The initial ambient light contrast of the display area; is the factor affecting the lighting direction.

[0036] The second object of the present invention is to provide a system for the OLED display contrast enhancement method described in any one of the above, which comprises a light sensing unit, a reference contrast acquisition unit, an initial ambient light contrast calculation unit, a pixel point ambient light contrast calculation unit and a light intensity enhancement unit;

[0037] The light sensing unit is arranged on the display screen, and is used to collect the ambient light illumination, and the display area that each light sensing unit is responsible for corresponds to a number of pixel points;

[0038] The reference contrast acquisition unit is used to acquire the contrast currently set on the display screen;

[0039] The output ends of the light sensing unit and the reference contrast acquisition unit are connected to the input end of the initial ambient light contrast calculation unit;

[0040] The initial ambient light contrast calculation unit is used to calculate the initial ambient light contrast;

[0041] The input end of the pixel point ambient light contrast calculation unit is connected to the light sensing unit, the reference contrast acquisition unit and the output end of the initial ambient light contrast calculation unit, and the pixel point ambient light contrast calculation unit is used to calculate the pixel point ambient light contrast;

[0042] The illumination enhancement unit enhances the contrast of the pixel points according to the initial ambient light contrast and the ambient light contrast of the pixel points.

[0043] The third object of the present invention is to provide a computer-readable storage medium, on which a program is stored. When the program is executed on a computer, the computer executes any one of the above-mentioned methods for enhancing the contrast of an OLED display screen.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] By real-time monitoring of ambient light and dynamic contrast adjustment, the display effect of OLED displays under various lighting conditions is significantly improved. This method not only improves the layering and clarity of the image, but also enhances the viewing comfort. At the same time, this method has wide applicability and good scalability, and is suitable for OLED displays of various sizes and resolutions, such as TVs, mobile phones, and tablets.

[0046] Specifically, ambient light sensors (ALS) are densely arranged to monitor the lighting conditions at different locations around the display in real time, and the contrast of each display area is dynamically adjusted based on these lighting data. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic diagram of the overall method process steps of the present invention. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] In order to facilitate understanding of the technical solution, some technical terms in the present invention are explained as follows:

[0050] OLED displays are different from traditional LCD displays. They do not require a backlight and use a very thin coating of organic materials and a glass substrate (or flexible organic substrate). These organic materials emit light when current passes through them.

[0051] Contrast refers to the brightness difference between black and white in an image. Adjusting the contrast can improve the layering and clarity of the image.

[0052] Ambient light contrast refers to the degree of contrast between the brightness and darkness of the image displayed on the display under a certain ambient light intensity.

[0053] However, there is actually no fixed value for ambient light contrast, because ambient light is always changing. For example, when it is bright, the indoor ambient light illuminance may be above 300LX, and when it is dark, it may be around 100LX, so it is impossible to mark the parameters of ambient light contrast.

[0054] See also Figure 1 As shown, the present invention provides a method for enhancing the contrast of an OLED display screen, which comprises the following steps:

[0055] S1. Obtaining the ambient light surface on the display screen. The ambient light surface refers to the bright surface displayed on the display screen when sunlight shines on it. Due to different sunlight shining angles and the influence of obstructions, the ambient light illuminance on the ambient light surface is also different. Therefore, densely arranged light sensing units are arranged on the display screen. The light sensing units are used to collect the ambient light illuminance (i.e., light intensity) of the display area they are responsible for. It should be noted that in the absence of sunlight, such as at night or on rainy days, the light sensing units collect the ambient light illuminance of the room, such as lights.

[0056] In addition, the display area that each light sensing unit is responsible for corresponds to a number of pixels.

[0057] That is, the ambient light surface is used to determine the ambient light illumination at different locations on the display screen.

[0058] S2. Obtain the contrast of the display screen currently set, and use this contrast as the reference contrast of S3.

[0059] S3, calculating the contrast of the display area of ​​the light sensing unit according to the reference contrast to obtain an initial ambient light contrast;

[0060] S4, calculating the contrast of the pixels in the current display area according to the initial ambient light contrast of the nearby display area to obtain the ambient light contrast of the pixels;

[0061] S5. Perform contrast enhancement processing according to the initial ambient light contrast and the pixel point ambient light contrast.

[0062] In the first embodiment, the display screen is a 75-inch TV display screen. Here we use 8K resolution to calculate the specific number of pixels, where 8K resolution is 7680 pixels in the horizontal direction and 4320 pixels in the vertical direction. Therefore, the total number of pixels of the 75-inch OLED display screen with 8K resolution is: 7680×4320=33177600.

[0063] Preferably, the light sensing unit adopts ALS (ambient light sensor). Specifically, ALS can be installed at any position behind the OLED display screen and supports the common sensor hub architecture used by ALS in traditional border positions. ALS senses the light passing through OLED pixels through special optical channels or transparent conductive materials, thereby avoiding affecting the display effect. This arrangement allows the device to have a higher screen-to-body ratio while maintaining the ambient light detection function.

[0064] The arrangement of ALS (hereinafter referred to as sensor) is as follows:

[0065] Horizontal settings,

[0066] Corner: Place a sensor at the upper left corner, upper right corner, lower left corner, and lower right corner of the screen;

[0067] Edges: Place sensors every 5-10 cm along the top and bottom edges of the screen. For a 75" (~190 cm diagonal) display, this means 12-24 sensors per side.

[0068] Central area: Place a sensor every 10-20 cm on the horizontal center line of the screen.

[0069] Vertical settings,

[0070] Center: Place a sensor at the center of the left and right sides of the screen;

[0071] Edges: Place sensors every 5-10 cm along the left and right edges of the screen. Given the screen height, this means 8-16 sensors can be placed on each side.

[0072] Central area: Place sensors every 10-20 cm on the vertical midline.

[0073] According to the above arrangement, assuming that a sensor is placed every 5 cm, 20 sensors can be placed on each of the four sides of the screen (up, down, left, and right), for a total of 80. In the center area of ​​the screen, a sensor is placed every 10 cm, so an additional 10 sensors can be placed horizontally and 5 sensors can be placed vertically.

[0074] In total, 95 sensors can be arranged across the entire screen. The benefit of this is that it can capture subtle changes in the ambient light around the screen, allowing the S3 and S4 to make more precise contrast adjustments.

[0075] Then, the 95 sensors are divided into different areas according to their positions, and the display area that each light sensing unit (i.e., sensor) is responsible for is determined. Specifically, for edge sensors, each sensor is responsible for a small rectangular area with a width of 5 cm and a height of 10 cm. For sensors in the center area, each sensor is responsible for a square area with a width of 10 cm and a height of 10 cm.

[0076] Perform S3, use a linear or nonlinear function to map the ambient light intensity to a contrast adjustment factor ( ), which represents the ratio of contrast adjustment required under specific lighting conditions relative to the reference contrast, where the contrast adjustment factor ( ) is calculated as follows:

[0077] ;

[0078] In the formula, is the contrast adjustment factor; is a constant, The choice of depends on the specific application scenario and user preference. Generally, a value less than 1 is selected; is the minimum ambient light threshold, which can be set to 0 lx or a low ambient light threshold, such as 5 lx, to ensure that no additional contrast adjustment is performed in darker environments. That is, when the ambient light is lower than this value, no contrast adjustment is performed; The ambient light intensity measured by the light sensor unit.

[0079] The initial ambient light contrast is obtained by multiplying the reference contrast and the adjustment factor:

[0080] ;

[0081] In the formula, is the initial ambient light contrast; is the reference contrast.

[0082] In summary, as the ambient light intensity increases, the contrast adjustment factor This will cause the initial ambient light contrast to Improve, thereby enhancing the visibility of the image. In addition, the introduction of nonlinear functions can better simulate the perception characteristics of the human eye under different lighting conditions. Under low ambient light illumination, the contrast adjustment is small; under high ambient light illumination, the contrast adjustment is large.

[0083] In S4, for each pixel, the light sensing unit in the area where the pixel is located and several adjacent light sensing units around it are found. By comparing the difference in ambient light intensity between adjacent light sensing units, the direction of the light can be determined. For example, if the ambient light intensity measured by the light sensing unit on the left is higher than that on the right, it can be inferred that the light comes from the left. Specifically:

[0084] The distance from the pixel to each adjacent light sensing unit is weighted. The closer the sensor is, the greater the impact on the light direction. The ambient light intensity difference is then used to determine the light direction. It is The ambient light intensity measured by adjacent light sensing units, Pixel To The distance between the light sensing units can define a light direction vector :

[0085] ;

[0086] In the formula, the weight function , From the pixel Point to The unit vector of the light sensing unit; Refers to pixels The ambient light intensity measured by the light sensing unit corresponding to the display area;

[0087] The light direction vector Perform normalization to obtain a normalized vector:

[0088] ;

[0089] Define a lighting direction factor , which is based on the normalized vector and preset lighting directions The angle between To calculate, we get:

[0090] ;

[0091] in, .

[0092] Finally, the pixel ambient light contrast is obtained:

[0093] ;

[0094] In the formula, It's a pixel The initial ambient light contrast of the display area.

[0095] Finally, according to the ambient light contrast of the pixel Pixel Contrast enhancement performed.

[0096] In the second embodiment, the arrangement of the ALS (hereinafter referred to as the sensor) is as follows:

[0097] The sensors are arranged in a rectangular array, and the distance between 5 pixels is defined as a unit distance, and the distance between two adjacent sensors is 10 unit distances. After the sensors are arranged in this way, it is ensured that each sensor can fall on a pixel. At this time, after S3 calculates the initial ambient light contrast, the contrast of the pixel corresponding to the sensor is enhanced according to the initial ambient light contrast, and the remaining pixels are enhanced according to the ambient light contrast of their corresponding pixels.

[0098] The calculation principles of the initial ambient light contrast and the pixel ambient light contrast are the same as those in the first embodiment and will not be elaborated here.

[0099] The second object of the present invention is to provide a system for a method for enhancing contrast of an OLED display screen, which includes a light sensing unit, a reference contrast acquisition unit, an initial ambient light contrast calculation unit, a pixel point ambient light contrast calculation unit, and an illumination enhancement unit;

[0100] The light sensing unit is arranged on the display screen, and is used to collect the ambient light illumination, and the display area that each light sensing unit is responsible for corresponds to a number of pixel points;

[0101] The reference contrast acquisition unit is used to acquire the contrast currently set on the display screen;

[0102] The output ends of the light sensing unit and the reference contrast acquisition unit are connected to the input end of the initial ambient light contrast calculation unit;

[0103] The initial ambient light contrast calculation unit is used to calculate the initial ambient light contrast, namely:

[0104] ;

[0105] The input end of the pixel point ambient light contrast calculation unit is connected to the light sensing unit, the reference contrast acquisition unit and the output end of the initial ambient light contrast calculation unit. The pixel point ambient light contrast calculation unit is used to calculate the pixel point ambient light contrast, that is:

[0106] ;

[0107] The illumination enhancement unit enhances the contrast of the pixel points according to the initial ambient light contrast and the ambient light contrast of the pixel points.

[0108] The third object of the present invention is to provide a computer-readable storage medium, on which a program is stored. When the program is executed on a computer, the computer executes a method for enhancing the contrast of an OLED display screen.

[0109] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for enhancing the contrast of an OLED display screen, characterized in that: The steps include: S1. Acquire the ambient light surface on the display screen to obtain the ambient light illumination at different positions on the display screen; S2, obtaining the contrast currently set on the display screen, and using this contrast as a reference contrast; S3, calculating the contrast of the display area of ​​the light sensing unit according to the reference contrast to obtain an initial ambient light contrast; S4, calculating the contrast of the pixels in the current display area according to the initial ambient light contrast of the nearby display area to obtain the ambient light contrast of the pixels; for each pixel, finding the light sensing unit in the area where the pixel is located and several adjacent light sensing units around it, and determining the direction of the light by comparing the difference in ambient light illumination between the adjacent light sensing units; specifically: The distance from the pixel to each adjacent light sensing unit is weighted. The closer the sensor is, the greater the impact on the light direction. The ambient light difference is then used to determine the light direction. It is The ambient light intensity measured by adjacent light sensing units, Pixel To The distance between the light sensing units can define a light direction vector : ； In the formula, the weight function , From the pixel Point to The unit vector of the light sensing unit; Refers to pixels The ambient light intensity measured by the light sensing unit corresponding to the display area; The light direction vector Perform normalization to obtain a normalized vector: ； Based on the normalized vector and preset lighting directions The angle between To calculate, get the lighting direction influence factor : ； in, ; The calculation formula for the pixel ambient light contrast is as follows: ； In the formula, is the ambient light contrast of the pixel; It's a pixel The initial ambient light contrast of the display area; S5. Perform contrast enhancement processing according to the initial ambient light contrast and the pixel point ambient light contrast.

2. The method for enhancing contrast of an OLED display screen according to claim 1, characterized in that: The display screen is provided with a light sensing unit, and the light sensing unit is used in S1 to collect the ambient light illumination of the display area; The display area that each light sensing unit is responsible for corresponds to a number of pixels.

3. The method for enhancing contrast of an OLED display screen according to claim 2, characterized in that: The light sensing unit adopts an ambient light sensor, and the ambient light sensor is installed at any position behind the OLED display screen.

4. The method for enhancing contrast of an OLED display screen according to claim 3, characterized in that: The arrangement of the ambient light sensor is as follows: Horizontal settings, Corner: Place a sensor at the upper left corner, upper right corner, lower left corner, and lower right corner of the screen; Edges: Place sensors every 5-10 cm along the top and bottom edges of the screen. Central area: Place a sensor every 10-20 cm on the horizontal center line of the screen; Vertical settings, Center: Place a sensor at the center of the left and right sides of the screen; Edges: Place sensors every 5-10 cm along the left and right edges of the screen. Central area: Place sensors every 10-20 cm on the vertical midline.

5. The method for enhancing contrast of an OLED display screen according to claim 4, characterized in that: For edge sensors, each sensor is responsible for a display area with a width of 5 cm and a height of 10 cm. For sensors in the center area, each sensor is responsible for a display area with a width of 10 cm and a height of 10 cm.

6. The method for enhancing contrast of an OLED display screen according to claim 3, characterized in that: The arrangement of the ambient light sensor is as follows: The sensors are arranged in a rectangular array, with the distance of 5 pixels defined as a unit distance and the distance between two adjacent sensors as 10 unit distances, so that each sensor can fall on a pixel point; After the initial ambient light contrast is calculated in S3, the contrast of the pixel corresponding to the sensor is enhanced according to the initial ambient light contrast, and the remaining pixels are enhanced according to the ambient light contrast of their corresponding pixels.

7. The method for enhancing contrast of an OLED display screen according to any one of claims 2 to 6, characterized in that: The calculation formula of the initial ambient light contrast in S3 is as follows: ； In the formula, is the initial ambient light contrast; is the reference contrast; is the contrast adjustment factor.

8. A system for the method for enhancing contrast of an OLED display screen according to any one of claims 1 to 7, characterized in that: It includes a light sensing unit, a reference contrast acquisition unit, an initial ambient light contrast calculation unit, a pixel point ambient light contrast calculation unit and a light intensity enhancement unit; The light sensing unit is arranged on the display screen, and is used to collect the ambient light illumination, and the display area that each light sensing unit is responsible for corresponds to a number of pixel points; The reference contrast acquisition unit is used to acquire the contrast currently set on the display screen; The output ends of the light sensing unit and the reference contrast acquisition unit are connected to the input end of the initial ambient light contrast calculation unit; The initial ambient light contrast calculation unit is used to calculate the initial ambient light contrast; The input end of the pixel point ambient light contrast calculation unit is connected to the light sensing unit, the reference contrast acquisition unit and the output end of the initial ambient light contrast calculation unit, and the pixel point ambient light contrast calculation unit is used to calculate the pixel point ambient light contrast; The illumination enhancement unit enhances the contrast of the pixel points according to the initial ambient light contrast and the ambient light contrast of the pixel points.

9. A computer-readable storage medium having a program stored thereon, characterized in that: When the program is executed on a computer, the computer is enabled to execute the method for enhancing the contrast ratio of an OLED display screen as described in any one of claims 1 to 7.

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