Method and system for improving low-brightness refresh rate of display screen

Abstract

The application discloses a method and system for improving low-brightness refresh rate of a display screen, comprising: setting the brightness of the display screen to the maximum brightness, keeping the maximum current gain unchanged, changing the gray scale of the display screen, detecting the display parameters of all the gray scales of the display screen, each gray scale corresponding to a group of display parameters; starting from the maximum current gain, gradually reducing the current gain of the display screen, calculating a calibration matrix each time the current gain of the display screen is reduced, and each current gain j of the display screen corresponding to a calibration matrix; according to the current picture of the display screen, selecting the current gain of the display screen matched with the current picture, and adjusting the display screen according to the calibration matrix corresponding to the current gain. The application selects the parameters with lower maximum brightness to reduce the change rate of the gray scale, so that the picture change is softer, the refresh rate of the picture is improved, and the user's eye fatigue and other problems caused by the low picture refresh rate are prevented.

Description

Technical Field

[0001] This invention relates to the field of LED display technology, and in particular to a method and system for improving the low-brightness refresh rate of a display screen. Background Technology

[0002] The refresh rate of LED displays is controlled by the driver chip. Although the driver chip can achieve a refresh rate of 3840Hz or 7680Hz, this value can only be achieved when the display is at its maximum brightness. As the brightness of the display decreases, the refresh rate of the display will also decrease because the grayscale decreases too quickly.

[0003] Assuming a display screen has a maximum brightness of 600 nits, indoor use typically involves levels below 300 nits, with some scenes even as low as 50 nits. At these levels, the screen's refresh rate is too low. Viewing images with low refresh rates will quickly cause eye fatigue, making sustained work impossible, and may even lead to dizziness, eye pain, and other discomfort. Therefore, a method is needed to maintain the refresh rate of LED displays even at low brightness levels. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides a method for improving the refresh rate of a display screen at low brightness. By calculating a calibration matrix using the display effects at different current gains of the screen, and then uniformly adjusting the refresh rate based on the calibration matrix, the problem of excessively low refresh rate in existing technologies at low brightness is solved.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for improving the low-brightness refresh rate of a display screen, comprising the following steps:

[0006] S1. Set the brightness of the display screen to the maximum brightness. Record the current gain of the display screen at this time as the maximum current gain. Keep the current gain of the display screen at the maximum current gain. Start changing the gray level of the display screen from the maximum gray level. Use a spectrophotometer to detect the display parameters of all gray levels of the display screen. Each gray level corresponds to a set of display parameters. Record the set of display parameters of all gray levels at this time as T0.

[0007] S2. Starting from the maximum current gain, gradually reduce the current gain of the display screen. Each time the display screen current gain is reduced, calculate a calibration matrix based on the display parameter set T0. Each order of display screen current gain j corresponds to a calibration matrix M. j The calculation of the calibration matrix continues until the current gain drops to 0.

[0008] S3. Based on the current display screen image, select a current gain that matches the current image, and then apply the calibration matrix M corresponding to the current gain. j Adjust the display screen.

[0009] Furthermore, the display parameters include brightness and color temperature.

[0010] Further, in step S1, during the detection of display parameters for all gray levels of the display screen using a spectrophotometer, the gray level i ranges from 1 to 65535. For each gray level i, the brightness L of the display screen is measured using a spectrophotometer. i and color temperature t i (x i ,y i ).

[0011] Furthermore, in step S2, the step of gradually reducing the current gain of the display screen starting from the maximum current gain is specifically implemented by reducing the current gain of the display screen proportionally from the maximum current gain.

[0012] Furthermore, the stated proportion is 10%.

[0013] Further, in step S2, the calculation of the calibration matrix based on the display parameter set T0 is specifically implemented as follows: after each reduction in the display screen current gain, the maximum gray level is calculated by multiplying the current gain relative to the maximum current gain of the display screen by this ratio to obtain the calibration gray level, and the maximum brightness L of the display screen at this time is detected by a spectrophotometer. j and color temperature t j (x j ,y j Until the display reaches its maximum brightness L. j and color temperature t j The brightness L corresponding to the calibration grayscale i and color temperature t i Similarly, the adjustment coefficient is the calibration matrix M. j .

[0014] Furthermore, the display parameters also include chromaticity z, and the specific formula for the calibration matrix is:

[0015]

[0016] Where R, G, and B are the values ​​of the red, green, and blue channels, respectively, and RX... D For the target value, RX D The values ​​are the raw values ​​measured by the spectrophotometer, where z is the colorimetric value. Y D =L i , Y O =L j ,

[0017] Furthermore, the specific implementation of selecting the current gain that matches the current image is as follows: calculate the current maximum brightness Lumi based on the current image and the current display brightness, and select the current gain that is closest to the current maximum brightness Lumi.

[0018] Through the above technical solution, the present invention has the following beneficial effects: it obtains display parameters of different gray levels at maximum brightness, and then adjusts the power circuit gain and calibrates according to the display parameters, thereby adjusting the screen in real time under low brightness conditions, so as to reduce the gray level drop speed while maintaining the display effect, thereby ensuring the screen refresh rate and improving the user's visual experience. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall process of a method for improving the low-brightness refresh rate of a display screen according to the present invention.

[0020] Figure 2 This is a schematic diagram of a system structure for improving the low-brightness refresh rate of a display screen, provided as an embodiment of the present invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Example 1

[0024] See Figure 1 A method for improving the low-brightness refresh rate of a display screen includes the following steps:

[0025] S1. Set the brightness of the display screen to the maximum brightness. Record the current gain of the display screen at this time as the maximum current gain. Keep the current gain of the display screen at the maximum current gain. Start changing the gray level of the display screen from the maximum gray level. Use a spectrophotometer to detect the display parameters of all gray levels of the display screen. Each gray level corresponds to a set of display parameters. Record the set of display parameters of all gray levels at this time as T0.

[0026] S2. Starting from the maximum current gain, gradually reduce the current gain of the display screen. Each time the display screen current gain is reduced, calculate a calibration matrix based on the display parameter set T0. Each order of display screen current gain j corresponds to a calibration matrix M.j The calculation of the calibration matrix continues until the current gain drops to 0.

[0027] S3. Based on the current display screen image, select a current gain that matches the current image, and then apply the calibration matrix M corresponding to the current gain. j Adjust the display screen.

[0028] Furthermore, the display parameters include brightness and color temperature.

[0029] Brightness refers to the intensity of light emitted by the screen, which determines the visual brightness of images or text on the screen. Color temperature is a unit of measurement for the color components contained in light; these display parameters are measured for subsequent image calibration.

[0030] Further, in step S1, during the detection of display parameters for all gray levels of the display screen using a spectrophotometer, the gray level i ranges from 1 to 65535. For each gray level i, the brightness L of the display screen is measured using a spectrophotometer. i and color temperature t i (x i ,y i ).

[0031] Grayscale refers to the different brightness levels of pixels in a digital image, ranging from the darkest to the brightest. Therefore, with the same current gain, different grayscale levels will result in different brightness levels on the screen. The screen can display the maximum brightness when the grayscale level is at its maximum.

[0032] Furthermore, in step S2, the step of gradually reducing the current gain of the display screen starting from the maximum current gain is specifically implemented by reducing the current gain of the display screen proportionally from the maximum current gain.

[0033] Furthermore, the stated proportion is 10%.

[0034] Choose an appropriate ratio to gradually reduce the current gain. Different current gains correspond to different maximum brightness to adapt to different images.

[0035] Further, in step S2, the calculation of the calibration matrix based on the display parameter set T0 is specifically implemented as follows: after each reduction in the display screen current gain, the maximum gray level is calculated by multiplying the current gain relative to the maximum current gain of the display screen by this ratio to obtain the calibration gray level, and the maximum brightness L of the display screen at this time is detected by a spectrophotometer. j and color temperature t j (x j ,y j Until the display reaches its maximum brightness L. j and color temperature t jThe brightness L corresponding to the calibration grayscale i and color temperature t i Similarly, the adjustment coefficient is the calibration matrix M. j .

[0036] By calibrating the image parameters at different gray levels under different current gains with the same brightness at the maximum current gain, we can ensure that the image effect remains consistent under different current gains and that there will be no sudden changes in the image due to changes in current gain, so as to maintain the same visual experience.

[0037] Furthermore, the display parameters also include chromaticity z, and the specific formula for the calibration matrix is:

[0038]

[0039] Where R, G, and B are the values ​​of the red, green, and blue channels, respectively, and RX... D For the target value, RX D The values ​​are the raw values ​​measured by the spectrophotometer, where z is the colorimetric value. Y D =L i , Y O =L j ,

[0040] Furthermore, the specific implementation of selecting the current gain that matches the current image is as follows: calculate the current maximum brightness Lumi based on the current image and the current display brightness, and select the current gain that is closest to the current maximum brightness Lumi.

[0041] By selecting a parameter with lower maximum brightness, the rate of grayscale change is reduced, resulting in smoother image changes, improved image refresh rate, and prevention of eye strain and other problems caused by low image refresh rate.

[0042] Example 2

[0043] like Figure 2 As shown, a system for improving the low-brightness refresh rate of a display screen includes:

[0044] The parameter detection module is used to set the brightness of the display screen to the maximum brightness, and record the current gain of the display screen at this time as the maximum current gain. Keeping the current gain of the display screen at the maximum current gain unchanged, the gray level of the display screen is changed starting from the maximum gray level. The display parameters of all gray levels of the display screen are detected by a spectrophotometer. Each gray level corresponds to a set of display parameters. The set of display parameters of all gray levels at this time is recorded as T0.

[0045] The matrix calculation module is used to gradually reduce the display screen's current gain, starting from the maximum current gain. Each reduction in the display screen's current gain calculates a calibration matrix based on the display parameter set T0. Each order of display screen current gain j corresponds to a calibration matrix M. j The calculation of the calibration matrix continues until the current gain drops to 0.

[0046] The image adjustment module is used to select a current gain that matches the current image displayed on the screen, and to adjust the current gain according to the calibration matrix M. j Adjust the display screen.

[0047] The embodiments disclosed in this specification are merely illustrative of one aspect of the invention, and the scope of protection of the invention is not limited to these embodiments. Any other functionally equivalent embodiments fall within the scope of protection of the invention. Those skilled in the art can make various other corresponding changes and modifications based on the technical solutions and concepts described above, and all such changes and modifications should fall within the scope of protection of the claims of this invention.

Claims

1. A method for improving the low-brightness refresh rate of a display screen, characterized in that, Includes the following steps: S1. Set the brightness of the display screen to the maximum brightness. Record the current gain of the display screen at this time as the maximum current gain. Keep the current gain of the display screen at the maximum current gain. Start changing the gray level of the display screen from the maximum gray level. Use a spectrophotometer to detect the display parameters of all gray levels of the display screen. Each gray level corresponds to a set of display parameters. Record the set of display parameters of all gray levels at this time as T0. S2. Starting from the maximum current gain, gradually reduce the current gain of the display screen. Each time the display screen current gain is reduced, calculate a calibration matrix based on the display parameter set T0. Each order of display screen current gain j corresponds to a calibration matrix. The calculation of the calibration matrix continues until the current gain drops to 0. S3. Based on the current display screen image, select the display screen current gain that matches the current display screen image, and then apply the calibration matrix corresponding to the current gain. Adjust the display screen. In step S2, the calculation of the calibration matrix based on the display parameter set T0 is specifically implemented as follows: after each reduction in the display screen current gain, the maximum gray level is calculated by multiplying the current gain relative to the maximum current gain of the display screen by this ratio to obtain the calibration gray level, and the maximum brightness of the display screen at this time is detected by using a spectrophotometer. and color temperature Adjust until the screen reaches its maximum brightness. and color temperature Brightness corresponding to the calibration grayscale and color temperature The same applies; the adjustment factor is the calibration matrix. .

2. The method for improving the low-brightness refresh rate of a display screen according to claim 1, characterized in that, The display parameters include brightness and color temperature.

3. The method for improving the low-brightness refresh rate of a display screen according to claim 1, characterized in that, In step S1, during the detection of display parameters for all gray levels of the display screen using a spectrophotometer, for each gray level i, the brightness of the display screen is measured using a spectrophotometer. and color temperature The grayscale i ranges from 1 to 65535.

4. The method for improving the low-brightness refresh rate of a display screen according to claim 1, characterized in that, In step S2, the current gain of the display screen is gradually reduced starting from the maximum current gain. Specifically, the current gain of the display screen is reduced proportionally from the maximum current gain.

5. A method for improving the low-brightness refresh rate of a display screen according to claim 4, characterized in that, The ratio is 10%.

6. The method for improving the low-brightness refresh rate of a display screen according to claim 1, characterized in that, The display parameters also include chromaticity z, and the specific formula for the calibration matrix is: Where R, G, and B are the values ​​for the red, green, and blue channels, respectively. For the target value, The values ​​are the raw values ​​measured by the spectrophotometer, where z is the colorimetric value. , = , , , = , .

7. A method for improving the low-brightness refresh rate of a display screen according to claim 1, characterized in that, The specific implementation of selecting the current gain that matches the current image is as follows: calculate the current maximum brightness Lumi based on the current image and the current display brightness, and select the current gain that is closest to the current maximum brightness Lumi.

8. A system for improving the low-brightness refresh rate of a display screen, characterized in that, include: The parameter detection module is used to set the brightness of the display screen to the maximum brightness, and record the current gain of the display screen at this time as the maximum current gain. Keeping the current gain of the display screen at the maximum current gain unchanged, the gray level of the display screen is changed starting from the maximum gray level. The display parameters of all gray levels of the display screen are detected by a spectrophotometer. Each gray level corresponds to a set of display parameters. The set of display parameters of all gray levels at this time is recorded as T0. The matrix calculation module is used to gradually reduce the display screen's current gain, starting from the maximum current gain. Each reduction in the display screen's current gain calculates a calibration matrix based on the display parameter set T0. Each order of display screen current gain j corresponds to one calibration matrix. The calculation of the calibration matrix will stop when the current gain drops to 0. The specific implementation of calculating a calibration matrix based on the display parameter set T0 is as follows: After each reduction in the display screen current gain, the maximum gray level is calculated by multiplying the current gain relative to the maximum current gain of the display screen by the ratio of the current gain to the maximum current gain of the display screen, and the calibration gray level is obtained by detecting the maximum brightness of the display screen at this time using a spectrophotometer. and color temperature Adjust until the screen reaches its maximum brightness. and color temperature Brightness corresponding to the calibration grayscale and color temperature The same applies; the adjustment factor is the calibration matrix. ; The image adjustment module is used to select a current gain that matches the current image displayed on the screen, and then apply this current gain to the corresponding calibration matrix. Adjust the display screen.

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