Method for forming display parameters of liquid crystal display screen for industrial control

Abstract

The invention discloses a liquid crystal display screen display parameter forming method for industrial control. The method comprises the steps that the minimum gray scale brightness and the maximum gray scale brightness of a liquid crystal display screen are obtained; obtaining a target brightness value of each gray scale based on a standard Gamma curve; obtaining the relationship between the gray-scale voltage of the liquid crystal display screen and each gray-scale brightness; displaying a preset gray-scale picture on the liquid crystal display screen, dynamically adjusting the gray-scale voltage of the liquid crystal display screen, obtaining a change relationship between the gray-scale voltage and the Flicker value of the liquid crystal display screen, and taking the gray-scale voltage corresponding to the minimum Flicker value as a target gray-scale voltage; constructing an additional weight optimization model to obtain an optimal target voltage matched with the target brightness value and the Flicker value of each gray scale; and adjusting the anode voltage and the cathode voltage corresponding to each gray scale. The method has the advantages that the brightness uniformity and the color stability of the liquid crystal display screen are optimized by accurately adjusting the relationship between the gray-scale voltage and the brightness value. And by minimizing the Flicker value, the stability of the display effect is further improved.

Description

Technical Field

[0001] The invention relates to parameter adjustment, and in particular to a method for forming display parameters of a liquid crystal display screen for industrial control. Background Art

[0002] In the field of industrial control, liquid crystal display screens are widely used in various monitoring and operation interfaces. The brightness and grayscale adjustment of the display screen are key factors to ensure the display effect and user experience. The relationship between the grayscale voltage and brightness of the liquid crystal display screen is affected by the Gamma curve. Different grayscale voltages correspond to different brightness values, but traditional methods often cannot accurately control the matching between the grayscale voltage and the brightness, resulting in nonlinear display effects and even flickering (Flicker) and other problems, thus affecting the operation accuracy and visual effects in industrial control. Therefore, how to improve the brightness performance of the display screen and reduce the Flicker value by optimizing the grayscale voltage has become an important direction for the optimization of liquid crystal display screens. This method is based on the first and second brightness values ​​of the minimum grayscale brightness and the maximum grayscale brightness of the liquid crystal display screen. By introducing the standard Gamma curve, the relationship between the target brightness value and the grayscale voltage, combined with the dynamic adjustment of the Flicker value, the target grayscale voltage of each grayscale is optimized. Finally, by constructing an additional weight optimization model, the brightness and Flicker value of each grayscale are ensured to achieve the best match, significantly improving the display effect and stability of the liquid crystal display screen.

[0003] The display parameters of LCD screens currently on the market mainly include resolution, brightness, contrast, color gamut, response time and refresh rate. Resolution determines the clarity of the display. Common ones include 1920×1080 and 3840×2160. The higher the resolution, the finer the image. Brightness is measured in cd / m². The higher the brightness, the better the readability of the screen in a strong light environment. Contrast refers to the difference in brightness between the brightest and darkest areas. A higher contrast can improve the layering of the picture. Color gamut reflects the range of colors that the display can present. The wider the color gamut, the richer the colors. Common standards include sRGB and AdobeRGB. Response time is measured in milliseconds (ms). The shorter the response time, the clearer the dynamic picture. Refresh rate refers to the number of times the picture is updated per second. Common ones include 60Hz, 120Hz, 144Hz, etc. A high refresh rate can provide a smoother display effect. Summary of the invention

[0004] In order to improve the existing method for forming the display parameters of liquid crystal display screens, a method for forming the display parameters of liquid crystal display screens for industrial control is provided. This method obtains the brightness value of different grayscale images, combines the Gamma curve and the grayscale voltage relationship, and dynamically adjusts the grayscale voltage to minimize the Flicker value and optimize the display effect. Finally, the target voltage of each grayscale is adjusted based on the optimization model to achieve the best display parameters.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is: A method for forming display parameters of a liquid crystal display screen for industrial control, comprising: Acquire a first brightness value when the liquid crystal display screen displays a minimum grayscale image and a second brightness value when the liquid crystal display screen displays a maximum grayscale image; Based on the first brightness value and the second brightness value, the first brightness value and the second brightness value are brought into a standard gamma curve of the liquid crystal display to obtain a target brightness value of each gray scale; Based on the target brightness value and grayscale voltage of each grayscale, the relationship between the grayscale voltage of the liquid crystal display screen and the brightness of each grayscale is obtained to obtain the target grayscale voltage of each grayscale; Display a preset grayscale image on the LCD screen; Based on a preset grayscale image, dynamically adjust the grayscale voltage of the liquid crystal display, obtain the relationship between the grayscale voltage and the flicker value of the liquid crystal display, and obtain the minimum flicker value; The grayscale voltage corresponding to the minimum flicker value of the liquid crystal display screen is used as the target grayscale voltage; Based on the relationship between the grayscale brightness, flicker value and grayscale voltage of the LCD screen, an additional weight optimization model is constructed to obtain the optimal target voltage that matches the target brightness value and flicker value of each grayscale; The positive voltage and the negative voltage corresponding to each gray scale are adjusted according to the optimal gray scale voltage.

[0006] Preferably, the step of bringing the first brightness value and the second brightness value into a standard Gamma curve of a liquid crystal display screen to obtain a target brightness value of each grayscale specifically includes: When displaying the minimum grayscale, obtain the first brightness value of the LCD screen , when displaying the maximum grayscale, obtain the second brightness value of the LCD screen ; The specific formula of the standard Gamma curve is: , in, is the target brightness value corresponding to grayscale x, where x is the grayscale value, ranging from 0 to 255. is the gamma value, which is 2.2.

[0007] Preferably, the acquiring of the relationship between the grayscale voltage of the liquid crystal display screen and each grayscale brightness based on the target brightness value and grayscale voltage of each grayscale, and obtaining the target grayscale voltage of each grayscale specifically includes: Based on the target brightness value and grayscale voltage of each grayscale, a nonlinear model is constructed, and the relationship conforms to the formula: , in, is the brightness corresponding to gray level i, is the voltage corresponding to gray level i, A is a constant, in order to make the brightness reach the standard value, is the gamma value, which indicates the degree of nonlinear relationship between voltage and brightness. The gamma value is set to 2.2; The brightness values ​​of the LCD screen at different grayscale voltages were measured and recorded, and the model was fitted using the least squares method. For a given n data points, the error formula is: , Based on the fitting results, the parameters A and B with the smallest error between the model prediction value and the actual measurement value are obtained. , obtain the relationship model between the grayscale voltage and each grayscale brightness of the liquid crystal display; Based on the acquired relationship model between the grayscale voltage of the liquid crystal display screen and the brightness of each grayscale, a target grayscale voltage of each grayscale is acquired; The target grayscale voltage value of each grayscale is sent to the TCON board of the liquid crystal display, and the grayscale voltage of each grayscale of the liquid crystal display is adjusted to the target grayscale voltage required for the grayscale.

[0008] Preferably, displaying a preset grayscale image on the liquid crystal display screen specifically includes: The preset grayscale is not less than two-thirds of the maximum grayscale.

[0009] Preferably, dynamically adjusting the grayscale voltage of the liquid crystal display screen based on the preset grayscale picture, obtaining the relationship between the grayscale voltage and the flicker value of the liquid crystal display screen, and obtaining the minimum flicker value specifically includes: After the LCD screen displays a picture of a preset gray scale, adjusting the gray scale voltage of the LCD panel so that the gray scale voltage of the LCD panel changes from high to low or from low to high within a preset voltage range; The brightness value of the LCD panel is measured by an optical sensor to obtain the corresponding flicker value of the LCD panel in the process. The specific formula is: , Among them, a and b are parameters, which are affected by the material of the LCD screen. Get the minimum value of Flicker when

[0010] Preferably, the method of obtaining the best target voltage matching each grayscale target brightness value and Flicker value by constructing an additional weight optimization model based on the relationship between each grayscale brightness, Flicker value and grayscale voltage of the liquid crystal display screen includes: Based on the relationship between grayscale brightness and grayscale voltage and the relationship between flicker value and grayscale voltage, an additional weight optimization model is constructed, and the formula is: , Where n is the number of gray levels, is the target brightness value that will be received, is the actual brightness value of each grayscale of the ith order, is the weight coefficient, which controls the weight of brightness error and Flicker error. is the Flicker value under each grayscale voltage of the ith grayscale.

[0011] Preferably, the adjusting the positive electrode voltage and the negative electrode voltage corresponding to each gray scale according to the optimal gray scale voltage specifically includes: The optimal adjustment voltage based on the obtained gray scale x is sent to the TCON board of the LCD display; The positive voltage and the negative voltage corresponding to the gray scale x of the liquid crystal display screen are adjusted so that the changes of the positive voltage and the negative voltage corresponding to the gray scale x are equal to the optimal adjustment voltage of the gray scale x.

[0012] Compared with the prior art, the advantages of the present invention are: By precisely controlling the relationship between grayscale voltage and brightness value, the stability of display effect and image quality are effectively improved. First, by obtaining the brightness value when displaying the minimum and maximum grayscales, combined with the standard Gamma curve, the target brightness value of each grayscale is accurately calculated, laying the foundation for subsequent display adjustment. Then, based on the relationship between grayscale voltage and brightness, the grayscale voltage is dynamically adjusted to optimize the brightness uniformity of the LCD screen and reduce the color distortion caused by voltage fluctuations. By introducing the optimization of the Flicker value, the flicker phenomenon in the display process is minimized, thereby improving the user experience. In addition, by constructing an additional weight optimization model, the target brightness and Flicker value of each grayscale can be accurately matched, further improving the delicacy and stability of the display effect, and reducing the visual discomfort that may be caused by voltage mismatch. Overall, this method not only improves the display accuracy of the display screen through meticulous voltage adjustment and brightness optimization, but also greatly optimizes the comfort and performance in use, and has significant technical advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of the method proposed by the present invention; Figure 2 This is a schematic diagram of obtaining brightness values ​​proposed by the present invention; Figure 3 A schematic diagram of obtaining the grayscale voltage proposed by the present invention; Figure 4 A schematic diagram of a preset grayscale image proposed by the present invention; Figure 5 This is a schematic diagram of obtaining the minimum Flicker value proposed by the present invention; Figure 6A schematic diagram for obtaining the optimal target voltage proposed by the present invention; Figure 7 This is a schematic diagram of the adjustment proposed by the present invention. DETAILED DESCRIPTION

[0014] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0015] See also Figure 1 As shown, a method for forming display parameters of a liquid crystal display screen for industrial control includes: Step 1: Obtain a first brightness value when the LCD screen displays a minimum grayscale image and a second brightness value when the LCD screen displays a maximum grayscale image; Step 2: Based on the first brightness value and the second brightness value, bring them into the standard Gamma curve of the liquid crystal display to obtain the target brightness value of each gray scale; Step 3: Based on the target brightness value and grayscale voltage of each grayscale, the relationship between the grayscale voltage of the liquid crystal display and the brightness of each grayscale is obtained to obtain the target grayscale voltage of each grayscale; Step 4: Display the preset grayscale image on the LCD screen; Step 5: Based on the preset grayscale image, dynamically adjust the grayscale voltage of the liquid crystal display, obtain the relationship between the grayscale voltage and the flicker value of the liquid crystal display, and obtain the minimum flicker value; Step 6: taking the grayscale voltage corresponding to the minimum flicker value of the liquid crystal display as the target grayscale voltage; Step 7: Based on the relationship between the grayscale brightness, flicker value and grayscale voltage of the LCD screen, an additional weight optimization model is constructed to obtain the optimal target voltage that matches the target brightness value and flicker value of each grayscale; Step 8: Adjust the positive voltage and negative voltage corresponding to each gray scale according to the optimal gray scale voltage.

[0016] See also Figure 1 As shown, the first brightness value when the LCD screen displays the minimum grayscale image and the second brightness value when the LCD screen displays the maximum grayscale image are obtained, the signal generator generates a minimum grayscale signal and inputs it to the LCD screen so that the LCD screen displays the minimum grayscale image, and the optical sensor is used to measure the brightness of the LCD screen at this time as the first brightness value. The signal generator generates a maximum grayscale signal and inputs it to the LCD screen so that the LCD screen displays the maximum grayscale image, and the optical sensor is used to measure the brightness of the LCD screen at this time as the second brightness value.

[0017] See also Figure 2As shown, based on the first brightness value and the second brightness value, the first brightness value and the second brightness value are brought into the standard Gamma curve of the liquid crystal display screen to obtain the target brightness value of each gray scale, specifically including: When displaying the minimum grayscale, obtain the first brightness value of the LCD screen , when displaying the maximum grayscale, obtain the second brightness value of the LCD screen ; The specific formula of the standard Gamma curve is: , in, is the target brightness value corresponding to grayscale x, where x is the grayscale value, ranging from 0 to 255. is the gamma value, which is 2.2.

[0018] See also Figure 3 As shown, based on the target brightness value and grayscale voltage of each grayscale, the relationship between the grayscale voltage of the liquid crystal display and the brightness of each grayscale is obtained, and the target grayscale voltage of each grayscale is obtained, which specifically includes: Based on the target brightness value and grayscale voltage of each grayscale, a nonlinear model is constructed, and the relationship conforms to the formula: , in, is the brightness corresponding to gray level i, is the voltage corresponding to gray level i, A is a constant, in order to make the brightness reach the standard value, is the gamma value, which indicates the degree of nonlinear relationship between voltage and brightness. The gamma value is set to 2.2; The brightness values ​​of the LCD screen at different grayscale voltages were measured and recorded, and the model was fitted using the least squares method. For a given n data points, the error formula is: , Based on the fitting results, the parameters A and B with the smallest error between the model prediction value and the actual measurement value are obtained. , obtain the relationship model between the grayscale voltage and each grayscale brightness of the liquid crystal display; Based on the acquired relationship model between the grayscale voltage of the liquid crystal display screen and the brightness of each grayscale, a target grayscale voltage of each grayscale is acquired; The target grayscale voltage value of each grayscale is sent to the TCON board of the liquid crystal display, and the grayscale voltage of each grayscale of the liquid crystal display is adjusted to the target grayscale voltage required for the grayscale.

[0019] Among them, the relationship between the target brightness value of each grayscale and the grayscale voltage can be measured by an optical sensor. Specifically, the brightness value of the screen displayed by the liquid crystal display under different grayscale voltages is measured by an optical sensor, and the relationship between the grayscale voltage and the brightness of the liquid crystal display is calculated based on the different grayscale voltages and their corresponding brightness values.

[0020] See also Figure 4 As shown, the LCD screen displays a preset grayscale image specifically including: The preset grayscale is not less than two-thirds of the maximum grayscale.

[0021] Specifically, the signal generator is first used to generate a grayscale signal of a preset grayscale, and the signal of the preset grayscale is sent to the liquid crystal display, so that the liquid crystal display displays a picture of the corresponding grayscale. The setting of the preset grayscale can be set by the user or by the system default, and the preset grayscale is not less than two-thirds of the maximum grayscale to ensure the accuracy of the subsequent measurement of the Flicker value of the liquid crystal panel. According to the positive proportional relationship between the brightness of the liquid crystal display and the grayscale, the greater the grayscale of the generated picture, the greater the brightness of the liquid crystal display, and at this time, the more accurate the measured Flicker value of the liquid crystal panel.

[0022] See also Figure 5 As shown, based on a preset grayscale picture, dynamically adjusting the grayscale voltage of the liquid crystal display screen, obtaining the relationship between the grayscale voltage and the flicker value of the liquid crystal display screen, and obtaining the minimum flicker value specifically include: After the LCD screen displays a picture of a preset gray scale, adjusting the gray scale voltage of the LCD panel so that the gray scale voltage of the LCD panel changes from high to low or from low to high within a preset voltage range; The brightness value of the LCD panel is measured by an optical sensor to obtain the corresponding flicker value of the LCD panel in the process. The specific formula is: , Among them, a and b are parameters, which are affected by the material of the LCD screen. Get the minimum value of Flicker when

[0023] Specifically, before gamma correction, the grayscale voltage is optimally adjusted to improve the accuracy of subsequent display parameter adjustment. Taking any grayscale x as an example, the grayscale voltage of the grayscale x of the liquid crystal panel is composed of a positive voltage and a negative voltage -, and the adjustment voltage of grayscale x is defined as the voltage amount by which both the positive voltage and the negative voltage corresponding to the grayscale x are changed. The positive voltage and the negative voltage of the grayscale voltage x of the liquid crystal display are both changed by the same voltage to ensure that the display brightness of the liquid crystal panel remains unchanged. The change in voltage amount is the change of the adjustment voltage from high to low or from low to high within the preset voltage range. Specifically, the adjustment voltage is increased from the preset minimum value in sequence by the minimum changeable voltage until it reaches the preset maximum value, and after each adjustment of the positive voltage and the negative voltage of the grayscale x, the brightness value of the liquid crystal panel at this time is measured by an optical sensor to obtain the flicker value of the liquid crystal panel at this time, thereby obtaining the flicker value of the liquid crystal panel during the change of the adjustment voltage of the grayscale x.

[0024] See also Figure 6 As shown, based on the relationship between the grayscale brightness, flicker value and grayscale voltage of the LCD display, the optimal target voltage matching the target brightness value and flicker value of each grayscale is obtained by constructing an additional weight optimization model, including: Based on the relationship between grayscale brightness and grayscale voltage and the relationship between flicker value and grayscale voltage, an additional weight optimization model is constructed, and the formula is: , Where n is the number of gray levels, is the target brightness value that will be received, is the actual brightness value of each grayscale of the ith order, is the weight coefficient, which controls the weight of brightness error and Flicker error. is the Flicker value under each grayscale voltage of the ith grayscale.

[0025] See also Figure 7 As shown, adjusting the positive voltage and the negative voltage corresponding to each gray scale according to the optimal gray scale voltage specifically includes: The optimal adjustment voltage based on the obtained gray scale x is sent to the TCON board of the LCD display; The positive voltage and the negative voltage corresponding to the gray scale x of the liquid crystal display screen are adjusted so that the changes of the positive voltage and the negative voltage corresponding to the gray scale x are equal to the optimal adjustment voltage of the gray scale x.

[0026] It should be noted that the sequence of the above embodiments of the present invention is only for description and does not represent the advantages and disadvantages of the embodiments. The above is a description of a specific embodiment of this specification. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0027] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for forming display parameters of a liquid crystal display screen for industrial control, characterized in that: include: Acquire a first brightness value when the liquid crystal display screen displays a minimum grayscale image and a second brightness value when the liquid crystal display screen displays a maximum grayscale image; Based on the first brightness value and the second brightness value, the first brightness value and the second brightness value are brought into a standard gamma curve of the liquid crystal display to obtain a target brightness value of each gray scale; Based on the target brightness value and grayscale voltage of each grayscale, the relationship between the grayscale voltage of the liquid crystal display screen and the brightness of each grayscale is obtained to obtain the target grayscale voltage of each grayscale; Display a preset grayscale image on the LCD screen; Based on a preset grayscale image, dynamically adjust the grayscale voltage of the liquid crystal display, obtain the relationship between the grayscale voltage and the flicker value of the liquid crystal display, and obtain the minimum flicker value; The grayscale voltage corresponding to the minimum flicker value of the liquid crystal display screen is used as the target grayscale voltage; Based on the relationship between the grayscale brightness, flicker value and grayscale voltage of the LCD screen, an additional weight optimization model is constructed to obtain the optimal target voltage that matches the target brightness value and flicker value of each grayscale; The positive voltage and the negative voltage corresponding to each gray scale are adjusted according to the optimal gray scale voltage.

2. A method for forming display parameters of a liquid crystal display screen for industrial control according to claim 1, characterized in that: The step of bringing the first brightness value and the second brightness value into a standard Gamma curve of the liquid crystal display screen to obtain a target brightness value of each grayscale specifically includes: When displaying the minimum grayscale, obtain the first brightness value of the LCD screen , when displaying the maximum grayscale, obtain the second brightness value of the LCD screen ; The specific formula of the standard Gamma curve is: , in, is the target brightness value corresponding to grayscale x, where x is the grayscale value, ranging from 0 to 255. is the gamma value, which is 2.

2.

3. A method for forming display parameters of a liquid crystal display screen for industrial control according to claim 1, characterized in that: The step of obtaining the relationship between the grayscale voltage of the liquid crystal display screen and the brightness of each grayscale based on the target brightness value and grayscale voltage of each grayscale to obtain the target grayscale voltage of each grayscale specifically includes: Based on the target brightness value and grayscale voltage of each grayscale, a nonlinear model is constructed, and the relationship conforms to the formula: , in, is the brightness corresponding to gray level i, is the voltage corresponding to gray level i, A is a constant, which makes the brightness reach the standard value. is the gamma value, which indicates the degree of nonlinear relationship between voltage and brightness. The gamma value is set to 2.2; The brightness values ​​of the LCD screen at different grayscale voltages were measured and recorded, and the model was fitted using the least squares method. For a given n data points, the error formula is: , Based on the fitting results, the parameters A and B with the smallest error between the model prediction value and the actual measurement value are obtained. , obtain the relationship model between the grayscale voltage and each grayscale brightness of the liquid crystal display; Based on the acquired relationship model between the grayscale voltage of the liquid crystal display screen and the brightness of each grayscale, a target grayscale voltage of each grayscale is acquired; The target grayscale voltage value of each grayscale is sent to the TCON board of the liquid crystal display, and the grayscale voltage of each grayscale of the liquid crystal display is adjusted to the target grayscale voltage required for the grayscale.

4. The method for forming display parameters of a liquid crystal display screen for industrial control according to claim 1, characterized in that: The step of displaying a preset grayscale image on the liquid crystal display screen specifically includes: The preset grayscale is not less than two-thirds of the maximum grayscale.

5. The method for forming display parameters of a liquid crystal display screen for industrial control according to claim 1, characterized in that: The dynamically adjusting the grayscale voltage of the liquid crystal display screen based on the preset grayscale picture, obtaining the relationship between the grayscale voltage and the flicker value of the liquid crystal display screen, and obtaining the minimum flicker value specifically includes: After the LCD screen displays a picture of a preset gray scale, adjusting the gray scale voltage of the LCD panel so that the gray scale voltage of the LCD panel changes from high to low or from low to high within a preset voltage range; The brightness value of the LCD panel is measured by an optical sensor to obtain the corresponding flicker value of the LCD panel in the process. The specific formula is: , Among them, a and b are parameters, which are affected by the material of the LCD screen. Get the minimum value of Flicker when 6. A method for forming display parameters of a liquid crystal display screen for industrial control according to claim 1, characterized in that: The relationship between the grayscale brightness, flicker value and grayscale voltage of the liquid crystal display screen is based on constructing an additional weight optimization model to obtain the best target voltage matching the target brightness value and flicker value of each grayscale, including: Based on the relationship between grayscale brightness and grayscale voltage and the relationship between flicker value and grayscale voltage, an additional weight optimization model is constructed, and the formula is: , Where n is the number of gray levels, is the target brightness value that will be received, is the actual brightness value of each grayscale of the ith order, is the weight coefficient, which controls the weight of brightness error and Flicker error. is the Flicker value under each i-th grayscale voltage.

7. A method for forming display parameters of a liquid crystal display screen for industrial control according to claim 1, characterized in that: The step of adjusting the positive voltage and the negative voltage corresponding to each gray scale according to the optimal gray scale voltage specifically includes: The optimal adjustment voltage based on the obtained gray scale x is sent to the TCON board of the LCD display; The positive voltage and the negative voltage corresponding to the gray scale x of the liquid crystal display screen are adjusted so that the changes of the positive voltage and the negative voltage corresponding to the gray scale x are equal to the optimal adjustment voltage of the gray scale x.

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