Image hue control method for LED display screen based on temperature change

Abstract

The present invention discloses a method for controlling the image hue of an LED display screen based on temperature change, and relates to the field of hue control of an LED display screen; the method comprises the following steps: initial calibration, calibrating the LED display screen at a standard temperature, and recording the luminous parameters and color parameters of LED light-emitting elements of each color; establishing a temperature-hue shift model, and establishing a color parameter and luminous parameter correlation model. The present invention establishes a temperature-hue shift model and a color parameter and luminous parameter correlation model, uses a sensor to obtain the actual operating temperature, and then uses the temperature-hue shift model to obtain the compensation amount to obtain the actual required output color, and then obtains the actual required input parameters according to the color parameter and luminous parameter correlation model, so that the light-emitting element can be compensated according to the temperature, thereby solving the influence of temperature on color shift and increasing the use effect.

Description

Technical Field

[0001] The invention relates to the field of LED display screen color tone control, and in particular to an LED display screen image color tone control method based on temperature change. Background Art

[0002] LED display is a display device that uses light-emitting diodes (LEDs) as display elements. The working principle of LED display is based on the characteristics of LEDs, that is, when a forward current passes through them, the LEDs will emit visible light. These LEDs are combined together in a specific arrangement to form pixels, and by controlling the brightness and color of each LED, the desired image or text can be created.

[0003] LED displays have many advantages, such as high brightness, long life, low power consumption, wide viewing angle, fast response, etc. They are often used in various occasions, such as exhibition halls, shopping malls, building curtain walls, TV stations, stages, traffic guides, etc. In these occasions, LED displays can display various images, texts, animations and videos, providing viewers with clear, vivid and diverse visual experiences.

[0004] However, in actual use, due to changes in ambient temperature and heat generation of light-emitting components, the LED's light color will deviate, which will cause color shift and color distortion on the LED screen, affecting the use effect.

[0005] To this end, the present invention proposes a method for controlling the image tone of an LED display screen based on temperature changes. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a method for controlling the image tone of an LED display screen based on temperature changes.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] The method for controlling the image tone of an LED display screen based on temperature change comprises the following steps:

[0009] S1: Initial calibration: calibrate the LED display at standard temperature and record the luminous parameters and color parameters of each color LED light-emitting element;

[0010] S2: Establish a temperature-hue shift model and a color parameter and luminous parameter correlation model, conduct heating and cooling experiments on the LED display, and establish a mathematical model between temperature and hue shift;

[0011] S3: Temperature sensing, using a temperature sensor to sense the actual working temperature of the LED display;

[0012] S4: Hue compensation, compensating the luminous parameters of the light-emitting elements of the LED display according to the temperature-hue shift model and the actual temperature collected.

[0013] Preferably: in the step S1, the standard temperature is 0°C or room temperature of 25°C, and the light-emitting parameters of the LED light-emitting element are its electrical parameters, specifically including voltage and current.

[0014] R∈(0,255)

[0015] The color parameters of the light emitting element are the three primary color parameters, specifically G∈(0, 255).

[0016] B∈(0,255)

[0017] Preferably: the step S2 comprises the following steps:

[0018] S21: Determine the temperature range of the experiment (T min , T max );

[0019] S22: Connect the LED display from T min Heating to T max Or from T max Cool down to T min , and in this process, the luminous color f(T)=f(R, G, B) of the luminous element is collected in real time, and f(T) is compared with f(T0)=f(R0, G0, B0) at the standard temperature;

[0020] S33: Establish a mathematical model based on the deviation relationship between f(T) and f(T0) relative to the temperature T.

[0021] Preferably: the step S33 specifically includes the following steps:

[0022] S331a: Data separation, taking the three primary colors R, G, and B as a single value, that is, temperature T is the independent variable, and the R, G, and B values ​​are three independent dependent variables;

[0023] S332a: Experimental curve is established, temperature is used as the horizontal coordinate, f(T)-f(T0) is used as the vertical coordinate, and a two-dimensional curve is established. The horizontal coordinate of the zero point of the two-dimensional curve is the standard temperature and the luminescence parameter corresponding to the standard temperature, that is, f(T0)=f(R0, G0, B0), f(T) is the R or G or B value at temperature T, and f(T0) is the R or G or B value at the standard temperature;

[0024] S333a: Curve supplement prediction, select one end of the experimental temperature, and then select n temperature points with Δt as the interval, that is, T max -Δt, Tmax -2Δt, ..., T max -nΔt or T min +Δt、T min +2Δt, ..., T min +nΔt, and obtain the luminescence parameter f(T) at each temperature point;

[0025] S334a: Differentiation curve, according to the formula Calculate the differential slope of two adjacent temperature points;

[0026] S335a: Relevance weighted summation, according to the formula Calculate the endpoint slope and use the endpoint value f(T max ) or f(T min ) is the current value, k T Supplement the curve;

[0027] S336a: According to steps S332a to S335a, the three dependent variables R, G, and B are predicted and supplemented respectively to form three curve models related to temperature.

[0028] Preferably: in the step S335a, p i k i The weight, p i -p i-1 ≥0.

[0029] Preferably: the step S33 specifically includes the following steps:

[0030] S331b: Data separation, taking the three primary colors R, G, and B as a single value, that is, temperature T is the independent variable, and the R, G, and B values ​​are three independent dependent variables;

[0031] S332b: Model logic is established, and g(T)=f(T)-f(T0) is set, where f(T) is the R, G or B value at temperature T, and f(T0) is the R, G or B value at standard temperature;

[0032] S333b: forming a curve according to the experimental results, and determining the derivative order n of the curve at the standard temperature;

[0033] S334b: The mathematical model is where g (n) (T0) is the nth derivative of g(T) at T0, n! is the factorial of n, R n (T) is the error function;

[0034] S335b: According to the model logic g(T)=f(T)-f(T0) and the actual value of g(T)=f(T)-f(T0), f(T) is obtained, and the mathematical model of the three dependent variables R, G, and B with respect to temperature T is obtained according to steps S333b and S334b.

[0035] Preferably: in the step S334b, Where a∈(T0,T) or a∈(T,T0).

[0036] Preferably, in step S2, the establishment of the color parameter and luminescence parameter correlation model includes the following steps:

[0037] A1: Arrange and combine the three primary colors to obtain (0, 0, 0) → (255, 255, 255) colors;

[0038] A2: For all colors, change the light-emitting parameters so that the light-emitting element emits light of the corresponding color;

[0039] A3: Collect all test results to form a model data set of luminous parameters and color parameters. U o，p，i and I o，p，i The light emitting element emits The color of the light corresponds to the voltage input and current input.

[0040] Preferably, in step S4, the method for tone compensation comprises the following steps:

[0041] S41: The temperature sensor collects the actual temperature of the LED display screen;

[0042] S42: inversely inferring the hue displayed by the required light-emitting element according to the temperature hue shift model;

[0043] S43: Determine input parameters of the light-emitting element according to the required displayed hue and the correlation model between the light-emitting parameters and the color parameters;

[0044] S44: Control the light-emitting element to emit light according to the input parameters.

[0045] The LED display image tone control system based on temperature change specifically includes:

[0046] A temperature acquisition module, which is used to collect the actual operating temperature of the light-emitting element;

[0047] A data processing module, which is used to determine the input of the light emitting element according to the temperature-hue shift model and the correlation model of the light emitting parameters and the color parameters in combination with the actual operating temperature;

[0048] The control execution module is used to control the execution of the light emitting element according to the input determined by the data processing module.

[0049] The beneficial effects of the present invention are:

[0050] 1. The present invention establishes a temperature-hue shift model and a color parameter and luminescence parameter correlation model, uses a sensor to obtain the actual working temperature, and then uses the temperature-hue shift model to obtain the compensation amount to obtain the actual required output color. Then, the actual required input parameters are obtained according to the color parameter and luminescence parameter correlation model, so that the light-emitting element can be compensated and controlled according to the temperature, which solves the influence of temperature on color shift and increases the use effect.

[0051] 2. The present invention establishes a temperature-hue shift model by adopting a curve model, and when establishing the model, the curve is supplemented by an experiment plus prediction, thereby reducing the workload of the experiment while ensuring accuracy, and when predicting the curve, a weight is adopted, and the distance between the weight and the prediction node is in descending order, which can make the prediction result more accurate.

[0052] 3. The present invention establishes a temperature-hue shift model in the form of a mathematical expression, and adds an error function to perform error control during the establishment, so that the final deviation result is more consistent with the actual situation, thereby increasing the accuracy of compensation and improving the use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 The present invention is a flow chart of a method for controlling image tone of an LED display screen based on temperature change. DETAILED DESCRIPTION

[0054] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0055] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] Embodiment 1:

[0057] The method for controlling the image tone of an LED display screen based on temperature change comprises the following steps:

[0058] S1: Initial calibration: calibrate the LED display at standard temperature and record the luminous parameters and color parameters of each color LED light-emitting element;

[0059] S2: Establish a temperature-hue shift model and a color parameter and luminous parameter correlation model, conduct heating and cooling experiments on the LED display, and establish a mathematical model between temperature and hue shift;

[0060] S3: Temperature sensing, using a temperature sensor to sense the actual working temperature of the LED display;

[0061] S4: Hue compensation, compensating the luminous parameters of the light-emitting elements of the LED display according to the temperature-hue shift model and the actual temperature collected.

[0062] In the step S1, the standard temperature is 0°C or room temperature of 25°C, and the light-emitting parameters of the LED light-emitting element are its electrical parameters, specifically including voltage and current.

[0063] R∈(0,255)

[0064] The color parameters of the image are the three primary color parameters, specifically G∈(0, 255).

[0065] B∈(0,255)

[0066] The step S2 comprises the following steps:

[0067] S21: Determine the temperature range of the experiment (T min , T max );

[0068] S22: Connect the LED display from T min Heating to T max Or from T max Cool down to T min , and in this process, the luminous color f(T)=f(R, G, B) of the luminous element is collected in real time, and f(T) is compared with f(T0)=f(R0, G0, B0) at the standard temperature;

[0069] S33: Establish a mathematical model based on the deviation relationship between f(T) and f(T0) relative to the temperature T.

[0070] The step S33 specifically includes the following steps:

[0071] S331a: Data separation, taking the three primary colors R, G, and B as a single value, that is, temperature T is the independent variable, and the R, G, and B values ​​are three independent dependent variables;

[0072] S332a: Experimental curve is established, temperature is used as the horizontal coordinate, f(T)-f(T0) is used as the vertical coordinate, and a two-dimensional curve is established. The horizontal coordinate of the zero point of the two-dimensional curve is the standard temperature and the luminescence parameter corresponding to the standard temperature, that is, f(T0)=f(R0, G0, B0), f(T) is the R or G or B value at temperature T, and f(T0) is the R or G or B value at the standard temperature;

[0073] S333a: Curve supplement prediction, select one end of the experimental temperature, and then select n temperature points with Δt as the interval, that is, T max -Δt, T max -2Δt, ..., T max -nΔt or T min +Δt、T min +2Δt, ..., T min +nΔt, and obtain the luminescence parameter f(T) at each temperature point;

[0074] S334a: Differentiation curve, according to the formula Calculate the differential slope of two adjacent temperature points;

[0075] S335a: Relevance weighted summation, according to the formula Calculate the endpoint slope and use the endpoint value f(T max ) or f(T min ) is the current value, k T Supplement the curve;

[0076] S336a: According to steps S332a to S335a, the three dependent variables R, G, and B are predicted and supplemented respectively to form three curve models related to temperature.

[0077] In the step S335a, p i k i The weight, p i -p i-1 ≥0.

[0078] In the step S2, the establishment of the color parameter and luminescence parameter correlation model includes the following steps:

[0079] A1: Arrange and combine the three primary colors to obtain (0, 0, 0) → (255, 255, 255) colors;

[0080] A2: For all colors, change the light-emitting parameters so that the light-emitting element emits light of the corresponding color;

[0081] A3: Collect all test results to form a model data set of luminous parameters and color parameters. U o，p，i and Io，p，i The light emitting element emits The color of the light corresponds to the voltage input and current input.

[0082] In step S4, the method for tone compensation comprises the following steps:

[0083] S41: The temperature sensor collects the actual temperature of the LED display screen;

[0084] S42: inversely inferring the hue displayed by the required light-emitting element according to the temperature hue shift model;

[0085] S43: Determine input parameters of the light-emitting element according to the required displayed hue and the correlation model between the light-emitting parameters and the color parameters;

[0086] S44: Control the light-emitting element to emit light according to the input parameters.

[0087] Embodiment 2:

[0088] The method for controlling the image tone of an LED display screen based on temperature change comprises the following steps:

[0089] S1: Initial calibration: calibrate the LED display at standard temperature and record the luminous parameters and color parameters of each color LED light-emitting element;

[0090] S2: Establish a temperature-hue shift model and a color parameter and luminous parameter correlation model, conduct heating and cooling experiments on the LED display, and establish a mathematical model between temperature and hue shift;

[0091] S3: Temperature sensing, using a temperature sensor to sense the actual working temperature of the LED display;

[0092] S4: Hue compensation, compensating the luminous parameters of the light-emitting elements of the LED display according to the temperature-hue shift model and the actual temperature collected.

[0093] In the step S1, the standard temperature is 0°C or room temperature of 25°C, and the light-emitting parameters of the LED light-emitting element are its electrical parameters, specifically including voltage and current.

[0094] R∈(0,255)

[0095] The color parameters of the image are the three primary color parameters, specifically G∈(0, 255).

[0096] B∈(0,255)

[0097] The step S2 comprises the following steps:

[0098] S21: Determine the temperature range of the experiment (T min , T max );

[0099] S22: Connect the LED display from T min Heating to T max Or from T max Cool down to T min , and in this process, the luminous color f(T)=f(R, G, B) of the luminous element is collected in real time, and f(T) is compared with f(T0)=f(R0, G0, B0) at the standard temperature;

[0100] S33: Establish a mathematical model based on the deviation relationship between f(T) and f(T0) relative to the temperature T.

[0101] The step S33 specifically includes the following steps:

[0102] S331b: Data separation, taking the three primary colors R, G, and B as a single value, that is, temperature T is the independent variable, and the R, G, and B values ​​are three independent dependent variables;

[0103] S332b: Model logic is established, and g(T)=f(T)-f(T0) is set, where f(T) is the R, G or B value at temperature T, and f(T0) is the R, G or B value at standard temperature;

[0104] S333b: forming a curve according to the experimental results, and determining the derivative order n of the curve at the standard temperature;

[0105] S334b: The mathematical model is where g (n) (T0) is the nth derivative of g(T) at T0, n! is the factorial of n, R n (T) is the error function;

[0106] S335b: According to the model logic g(T)=f(T)-f(T0) and the actual value of g(T)=f(T)-f(T0), f(T) is obtained, and the mathematical model of the three dependent variables R, G, and B with respect to temperature T is obtained according to steps S333b and S334b.

[0107] In the step S334b, Where a∈(T0,T) or a∈(T,T0).

[0108] In the step S2, the establishment of the color parameter and luminescence parameter correlation model includes the following steps:

[0109] A1: Arrange and combine the three primary colors to obtain (0, 0, 0) → (255, 255, 255) colors;

[0110] A2: For all colors, change the light-emitting parameters so that the light-emitting element emits light of the corresponding color;

[0111] A3: Collect all test results to form a model data set of luminous parameters and color parameters. U o，p，i and I o，p，i The light emitting element emits The color of the light corresponds to the voltage input and current input.

[0112] In step S4, the method for tone compensation comprises the following steps:

[0113] S41: The temperature sensor collects the actual temperature of the LED display screen;

[0114] S42: inversely inferring the hue displayed by the required light-emitting element according to the temperature hue shift model;

[0115] S43: Determine input parameters of the light-emitting element according to the required displayed hue and the correlation model between the light-emitting parameters and the color parameters;

[0116] S44: Control the light-emitting element to emit light according to the input parameters.

[0117] Embodiment 3:

[0118] The LED display image tone control system based on temperature change specifically includes:

[0119] A temperature acquisition module, which is used to collect the actual operating temperature of the light-emitting element;

[0120] A data processing module, which is used to determine the input of the light emitting element according to the temperature-hue shift model and the correlation model of the light emitting parameters and the color parameters in combination with the actual operating temperature;

[0121] The control execution module is used to control the execution of the light emitting element according to the input determined by the data processing module.

[0122] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for controlling the image tone of an LED display screen based on temperature change, characterized in that: It includes the following steps: S1: Initial calibration: calibrate the LED display at standard temperature and record the luminous parameters and color parameters of each color LED light-emitting element; S2: Establish a temperature-hue shift model and a color parameter and luminous parameter correlation model, conduct heating and cooling experiments on the LED display, and establish a mathematical model between temperature and hue shift; S3: Temperature sensing, using a temperature sensor to sense the actual working temperature of the LED display; S4: Hue compensation, compensating the luminous parameters of the light-emitting elements of the LED display according to the temperature-hue shift model and the actual temperature collected; The step S2 comprises the following steps: S21: Determine the temperature range of the experiment (T min , T max ); S22: Connect the LED display from T min Heating to T max Or from T max Cool down to T min , and in this process, the luminous color f(T)=f(R, G, B) of the luminous element is collected in real time, and f(T) is compared with f(T0)=f(R0, G0, B0) at the standard temperature; S33: establishing a mathematical model according to the deviation relationship between f(T) and f(T0) relative to the temperature T; The step S33 specifically includes the following steps: S331a: Data separation, taking the three primary colors R, G, and B as a single value, that is, temperature T is the independent variable, and the R, G, and B values ​​are three independent dependent variables; S332a: Experimental curve is established, temperature is used as the horizontal coordinate, f(T)-f(T0) is used as the vertical coordinate, and a two-dimensional curve is established. The horizontal coordinate of the zero point of the two-dimensional curve is the standard temperature and the luminescence parameter corresponding to the standard temperature, that is, f(T0)=f(R0, G0, B0), f(T) is the R or G or B value at temperature T, and f(T0) is the R or G or B value at the standard temperature; S333a: Curve supplement prediction, select one end of the experimental temperature, and then select n temperature points with Δt as the interval, that is, T max -Δt, T max -2Δt, ..., T max -nΔt or T min +Δt、T min +2Δt, ..., T min +nΔt, and obtain the luminescence parameter f(T) at each temperature point; S334a: Differentiation curve, according to the formula Calculate the differential slope of two adjacent temperature points; S335a: Relevance weighted summation, according to the formula Calculate the endpoint slope and use the endpoint value f(T max ) or f(T min ) is the current value, k T Supplement the curve; S336a: According to steps S332a to S335a, three dependent variables R, G, and B are predicted and supplemented respectively to form three curve models related to temperature; In the step S335a, p i k i The weight, p i -p i-1 ≥0.

2. The method for controlling the image tone of an LED display screen based on temperature change according to claim 1, characterized in that: In the step S1, the standard temperature is 0°C or room temperature of 25°C, the light-emitting parameters of the LED light-emitting element are its electrical parameters, specifically including voltage and current, and the color parameters of the LED light-emitting element are the three primary color parameters, specifically 3. The method for controlling the image tone of an LED display screen based on temperature change according to claim 1, characterized in that: The step S33 specifically includes the following steps: S331b: Data separation, taking the three primary colors R, G, and B as a single value, that is, temperature T is the independent variable, and the R, G, and B values ​​are three independent dependent variables; S332b: Model logic is established, and g(T)=f(T)-f(T0) is set, where f(T) is the R, G or B value at temperature T, and f(T0) is the R, G or B value at standard temperature; S333b: forming a curve according to the experimental results, and determining the derivative order n of the curve at the standard temperature; S334b: The mathematical model is where g (n) (T0) is the nth derivative of g(T) at T0, n! is the factorial of n, R n (T) is the error function; S335b: According to the model logic g(T)=f(T)-f(T0) and the actual value of g(T)=f(T)-f(T0), f(T) is obtained, and the mathematical model of the three dependent variables R, G, and B with respect to temperature T is obtained according to steps S333b and S334b.

4. The method for controlling the image tone of an LED display screen based on temperature change according to claim 3, characterized in that: In the step S334b, Where a∈(T0,T) or a∈(T,T0).

5. The method for controlling the image tone of an LED display screen based on temperature change according to claim 1, characterized in that: In the step S2, the establishment of the color parameter and luminescence parameter correlation model includes the following steps: A1: Arrange and combine the three primary colors to obtain (0, 0, 0) → (255, 255, 255) colors; A2: For all colors, change the light-emitting parameters so that the light-emitting element emits light of the corresponding color; A3: Collect all test results to form a model data set of luminous parameters and color parameters. U o，p，i and I o，p，i The light emitting element emits The color of the light corresponds to the voltage input and current input.

6. The method for controlling the image tone of an LED display screen based on temperature change according to claim 1, characterized in that: In step S4, the method for tone compensation comprises the following steps: S41: The temperature sensor collects the actual temperature of the LED display screen; S42: inversely inferring the hue displayed by the required light-emitting element according to the temperature hue shift model; S43: Determine input parameters of the light-emitting element according to the required displayed hue and the correlation model between the light-emitting parameters and the color parameters; S44: Control the light-emitting element to emit light according to the input parameters.

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