A real-time temperature detection device for a liquid crystal display screen and a control method thereof

Abstract

A real-time temperature detection device for a liquid crystal display screen and a control method thereof, comprising the steps of: turning on a thermal imager, setting the distance between the liquid crystal display screen and the thermal imager to be l, and obtaining a thermal imaging image of the liquid crystal display screen; turning on a CCD camera to obtain a real-time video frame image of the liquid crystal display screen; a temperature calculation module of an embedded processing system obtains the operating temperature T of a corresponding pixel position of the liquid crystal display screen according to the thermal imaging image and the real-time video frame image; and outputting and displaying the temperature of the nth block of the liquid crystal display screen. The present invention dynamically adjusts the proportional coefficients of the temperature values ​​of the α and β thermal imagers and the CCD camera according to different weather, temperature, and material factors, thereby greatly enhancing the accuracy of temperature measurement.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal display screens, and in particular to a real-time temperature detection device for a liquid crystal display screen and a control method thereof. Background Art

[0002] At present, when the LCD screen is running, the temperature will inevitably rise due to the thermal effect of the current. The difference between the temperature of the LCD screen and the ambient temperature, that is, the temperature rise, is caused by the heat of the LCD screen itself. If the temperature rise exceeds a certain value, it means that the LCD screen may be abnormal. If the fault is not promptly handled and eliminated, the heat will accelerate the aging of the equipment insulation and even damage the equipment. Therefore, temperature measurement is the main means of defect detection and early warning of LCD screens. At present, temperature measurement mainly relies on infrared detection technology, but this technology has problems in actual application, such as low resolution of detection equipment, large changes in the reflectivity of LCD screen materials, and greater influence of weather, resulting in low measurement accuracy.

[0003] In addition, the existing temperature measurement methods for LCD screens mainly consider a single temperature sensor or a single infrared imaging measurement. However, LCD screens are generally large, and the temperature at different positions on the screen corresponding to dozens of meters is different, resulting in rough and inaccurate measurements. As a result, LCD screens are often damaged due to operating temperature, etc., and there are few measurement methods that comprehensively consider multiple factors to reduce the impact of a single measurement on accuracy. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a real-time temperature detection device for a liquid crystal display screen and a control method thereof. The real-time temperature detection device for a liquid crystal display screen and a control method thereof of the present invention significantly improve the accuracy of the working temperature of the liquid crystal display screen, and the safety and convenience of the working of the liquid crystal display screen are greatly improved, and the user experience is enhanced; the present invention is implemented in the following ways:

[0005] A real-time temperature detection device for a liquid crystal display screen comprises a thermal imager for obtaining a thermal imaging image of a liquid crystal display screen; a CCD camera for obtaining a real-time video frame image of the liquid crystal display screen; a temperature calculation module of an embedded processing system for obtaining a working temperature T of a corresponding pixel position of the liquid crystal display screen according to the thermal imaging image and the real-time video frame image; and an output for displaying the temperature of an nth block of the liquid crystal display screen, wherein the temperature of the nth block is the average value of the sum of the temperatures corresponding to all pixels of the block; wherein the calculation process of the working temperature T is as follows:

[0006] T=αT1+βT2

[0007] T1=T a +R th *P*γ

[0008]

[0009] Wherein, T1 is the first temperature determined by the CCD camera and the luminous power consumption of the LCD screen, T2 is the second temperature of the acquired thermal imaging image pixel, R th is the thermal resistance between the LCD screen and the air environment, P is the power consumption, γ is the luminous color value coefficient at the pixel position (i, j) of the video frame image; H represents the gray value at the position (p1, p2) of the thermal imaging image, τ is the atmospheric infrared transmittance; α and β are the proportional coefficients of the temperature values ​​of the thermal imager and the CCD camera, respectively, where α+β=1;

[0010]

[0011] Where k is the slope of the linear segment of the response curve, ∈ is the specific emissivity of the entire spectral range of the target material; A s is the area of ​​the target small facet; A0 is the incident pupil area in the receiving system; l is the distance between the LCD screen and the thermal imager; θ s and θ0 are the angles between a point on the small facet and the center of the incident pupil and the normal direction of the small facet and the axis direction of the optical system, respectively, and C is a constant.

[0012] Preferably, the γ is a luminous color value coefficient, which is specifically expressed as:

[0013] γ=k1R+k2G+k3B

[0014] R is the R channel value of the RGB image obtained by the CCD camera, G is the G channel value of the RGB image obtained by the CCD camera, B is the B channel value of the RGB image obtained by the CCD camera, k1, k2, and k3 represent the weight coefficients of the R channel value, the G channel value, and the B channel value, respectively. The power consumption is lowest when the light is white light, and the power consumption is highest when the light is purple light.

[0015] Preferably, the CCD camera is connected to the embedded system via a processor interface MIPI.

[0016] Preferably, the CCD camera, after being used to acquire the real-time video frame image of the liquid crystal display screen, further comprises performing Gaussian filtering on the acquired video frame image.

[0017] Preferably, the thermal imager is an X384 infrared thermal imager, which is used to obtain thermal imaging images of the liquid crystal display screen.

[0018] The present invention also includes a control method for a real-time temperature detection device for a liquid crystal display screen, comprising the steps of: S1: turning on a thermal imager, setting the distance between the liquid crystal display screen and the thermal imager to be l, and obtaining a thermal imaging image of the liquid crystal display screen; S2: turning on a CCD camera to obtain a real-time video frame image of the liquid crystal display screen; S3: an embedded processing system temperature calculation module, obtaining a working temperature T of a corresponding pixel position of the liquid crystal display screen according to the thermal imaging image and the real-time video frame image; S4: outputting and displaying the temperature of the nth block of the liquid crystal display screen, wherein the temperature of the nth block is the average value of the sum of the temperatures corresponding to all pixels of the block; wherein the calculation process of the working temperature T is as follows:

[0019] T=αT1+βT2

[0020] T1=T a +R th *P*γ

[0021]

[0022] Wherein, T1 is the first temperature determined by the CCD camera and the luminous power consumption of the LCD screen, T2 is the second temperature of the acquired thermal imaging image pixel, R th is the thermal resistance between the LCD screen and the air environment, P is the power consumption, γ is the luminous color value coefficient at the pixel position (i, j) of the video frame image; H represents the gray value at the position (p1, p2) of the thermal imaging image, τ is the atmospheric infrared transmittance; α and β are the proportional coefficients of the temperature values ​​of the thermal imager and the CCD camera, respectively, where α+β=1;

[0023]

[0024] Where k is the slope of the linear segment of the response curve, ∈ is the specific emissivity of the entire spectral range of the target material; A s is the area of ​​the target small facet; A0 is the incident pupil area in the receiving system; l is the distance between the LCD screen and the thermal imager; θ s and θ0 are the angles between a point on the small facet and the center of the incident pupil and the normal direction of the small facet and the axis direction of the optical system, respectively, and C is a constant.

[0025] Preferably, the γ is a luminous color value coefficient, which is specifically expressed as:

[0026] γ=k1R+k2G+k3B

[0027] R is the R channel value of the RGB image obtained by the CCD camera, G is the G channel value of the RGB image obtained by the CCD camera, B is the B channel value of the RGB image obtained by the CCD camera, k1, k2, and k3 represent the weight coefficients of the R channel value, the G channel value, and the B channel value, respectively. The power consumption is lowest when the light is white light, and the power consumption is highest when the light is purple light.

[0028] Preferably, the CCD camera is connected to the embedded system via a processor interface MIPI.

[0029] Preferably, the CCD camera, after being used to acquire the real-time video frame image of the liquid crystal display screen, further comprises performing Gaussian filtering on the acquired video frame image.

[0030] Preferably, the thermal imager is an X384 infrared thermal imager, which is used to obtain thermal imaging images of the liquid crystal display screen.

[0031] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0032] The invention solves the problems that the traditional technology is affected by the large change of reflectivity of the liquid crystal display material and the great influence of weather, resulting in low measurement accuracy, and considers the problem of single temperature sensor or single infrared imaging measurement. The present application creatively considers the temperature of the thermal imager and the CCD image comprehensively, and dynamically adjusts the proportional coefficient of the temperature value of the α, β thermal imager and the CCD camera according to different weather, temperature and material factors, which greatly enhances the accuracy of temperature measurement. In addition, γ is the luminous color value coefficient, γ = k1R + k2G + k3B, k1, k2, k3 represent the weight coefficients of the R channel value, the G channel value and the B channel value respectively, and comprehensively considers the factors that the different power consumption of different color displays leads to different temperatures of the liquid crystal display, that is, when the light is white light, the power consumption is the lowest, and when the light is purple light, the power consumption is the highest, which greatly enhances the training effect and significantly improves the accuracy of the temperature measurement of the liquid crystal display. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a system diagram of a control method of a real-time temperature detection device for a liquid crystal display screen of the present invention. DETAILED DESCRIPTION

[0034] Those skilled in the art understand that, as mentioned in the background technology, the temperature measurement in the traditional technology mainly relies on infrared detection technology, but this technology has problems such as low resolution of the detection equipment, large changes in the reflectivity of the liquid crystal display material, and large influence of the weather in practical applications, resulting in low accuracy of the measurement. In addition, in the existing temperature measurement method of the liquid crystal display, a single temperature sensor or a single infrared imaging measurement is mainly considered, but the liquid crystal display is generally large, and the temperature of the display screen corresponding to several tens of meters is different at different positions, resulting in rough and inaccurate measurement, resulting in the liquid crystal display screen often causing device damage due to the working temperature, etc., and there are few measurement methods that comprehensively consider multiple factors to reduce the impact of a single measurement on the accuracy. A real-time temperature detection device for a liquid crystal display screen and a control method thereof of the present invention significantly improve the accuracy of the working temperature of the liquid crystal display screen, and the safety and convenience of the liquid crystal display screen are greatly improved, and the user experience is enhanced. In order to make the above-mentioned purposes, features and beneficial effects of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0035] Embodiment 1:

[0036] Figure 1 A system diagram of a control method for a real-time temperature detection device for a liquid crystal display screen of the present application is shown. In some embodiments, a real-time temperature detection device for a liquid crystal display screen includes a thermal imager for obtaining a thermal imaging image of a liquid crystal display screen; a CCD camera for obtaining a real-time video frame image of a liquid crystal display screen; an embedded processing system temperature calculation module for obtaining an operating temperature T of a corresponding pixel position of the liquid crystal display screen according to the thermal imaging image and the real-time video frame image; and an output for displaying the temperature of the nth block of the liquid crystal display screen, wherein the temperature of the nth block is the average value of the sum of the temperatures corresponding to all pixels of the block; wherein the calculation process of the operating temperature T is as follows:

[0037] T=αT1+βT2

[0038] T1=T a +R th *P*γ

[0039]

[0040] Wherein, T1 is the first temperature determined by the CCD camera and the luminous power consumption of the LCD screen, T2 is the second temperature of the acquired thermal imaging image pixel, R th is the thermal resistance between the LCD screen and the air environment, P is the power consumption, γ is the luminous color value coefficient at the pixel position (i, j) of the video frame image; H represents the gray value at the position (p1, p2) of the thermal imaging image, τ is the atmospheric infrared transmittance; α and β are the proportional coefficients of the temperature values ​​of the thermal imager and the CCD camera, respectively, where α+β=1;

[0041]

[0042] Where k is the slope of the linear segment of the response curve, ∈ is the specific emissivity of the entire spectral range of the target material; A s is the area of ​​the target small facet; A0 is the incident pupil area in the receiving system; l is the distance between the LCD screen and the thermal imager; θ s and θ0 are the angles between a point on the small facet and the center of the incident pupil and the normal direction of the small facet and the axis direction of the optical system, respectively, and C is a constant.

[0043] In this embodiment, γ is a luminous color value coefficient, which is specifically expressed as:

[0044] γ=k1R+k2G+k3B

[0045] R is the R channel value of the RGB image obtained by the CCD camera, G is the G channel value of the RGB image obtained by the CCD camera, B is the B channel value of the RGB image obtained by the CCD camera, k1, k2, and k3 represent the weight coefficients of the R channel value, the G channel value, and the B channel value, respectively. The power consumption is lowest when the light is white light, and the power consumption is highest when the light is purple light.

[0046] In this embodiment, the CCD camera is connected to the embedded system via the processor interface MIPI.

[0047] In this embodiment, the CCD camera is used to obtain the real-time video frame image of the liquid crystal display screen and further includes performing Gaussian filtering on the obtained video frame image.

[0048] In this embodiment, the thermal imager is an X384 infrared thermal imager, which is used to obtain thermal imaging images of the liquid crystal display screen.

[0049] Embodiment 2

[0050] The present invention also includes a control method for a real-time temperature detection device for a liquid crystal display screen, comprising the steps of: S1: turning on a thermal imager, setting a distance of l between the liquid crystal display screen and the thermal imager, and obtaining a thermal imaging image of the liquid crystal display screen; S2: turning on a CCD camera to obtain a real-time video frame image of the liquid crystal display screen; S3: an embedded processing system temperature calculation module, obtaining an operating temperature T of a corresponding pixel position of the liquid crystal display screen according to the thermal imaging image and the real-time video frame image; S4: outputting and displaying the temperature of the nth block of the liquid crystal display screen, wherein the temperature of the nth block is the average value of the sum of the temperatures corresponding to all pixels of the block; wherein the calculation process of the operating temperature T is as follows:

[0051] T=αT1+βT2

[0052] T1=T a +Rth *P*γ

[0053]

[0054] Wherein, T1 is the first temperature determined by the CCD camera and the luminous power consumption of the LCD screen, T2 is the second temperature of the acquired thermal imaging image pixel, R th is the thermal resistance between the LCD screen and the air environment, P is the power consumption, γ is the luminous color value coefficient at the pixel position (i, j) of the video frame image; H represents the gray value at the position (p1, p2) of the thermal imaging image, τ is the atmospheric infrared transmittance; α and β are the proportional coefficients of the temperature values ​​of the thermal imager and the CCD camera, respectively, where α+β=1;

[0055]

[0056] Where k is the slope of the linear segment of the response curve, ∈ is the specific emissivity of the entire spectral range of the target material; A s is the area of ​​the target small facet; A0 is the incident pupil area in the receiving system; l is the distance between the LCD screen and the thermal imager; θ s and θ0 are the angles between a point on the small facet and the center of the incident pupil and the normal direction of the small facet and the axis direction of the optical system, respectively, and C is a constant.

[0057] In some embodiments, the γ is a luminous color value coefficient, which is specifically expressed as:

[0058] γ=k1R+k2G+k3B

[0059] R is the R channel value of the RGB image obtained by the CCD camera, G is the G channel value of the RGB image obtained by the CCD camera, B is the B channel value of the RGB image obtained by the CCD camera, k1, k2, and k3 represent the weight coefficients of the R channel value, the G channel value, and the B channel value, respectively. The power consumption is lowest when the light is white light, and the power consumption is highest when the light is purple light.

[0060] In this embodiment, the CCD camera is connected to the embedded system via the processor interface MIPI.

[0061] In this embodiment, the CCD camera is used to obtain the real-time video frame image of the liquid crystal display screen and further includes performing Gaussian filtering on the obtained video frame image.

[0062] In this embodiment, the thermal imager is an X384 infrared thermal imager, which is used to obtain thermal imaging images of the liquid crystal display screen.

[0063] The present invention discloses a real-time temperature detection device for a liquid crystal display screen and a control method thereof, which solves the problems that the reflectivity of the liquid crystal display screen material varies greatly and is greatly affected by the weather in the traditional technology, resulting in low measurement accuracy, and considering the problem of a single temperature sensor or a single infrared imaging measurement, the present invention creatively considers the temperature of the thermal imager and the CCD image comprehensively, and dynamically adjusts the proportional coefficients of the temperature values ​​of the α and β thermal imagers and the CCD camera according to different weather, temperature, and material factors, greatly enhancing the accuracy of temperature measurement. In addition, γ is the luminous color value coefficient, γ=k1R+k2G+k3B, k1, k2, and k3 represent the weight coefficients of the R channel value, the G channel value, and the B channel value, respectively, comprehensively considering the factors that the different power consumption of different color displays leads to different temperatures of the liquid crystal display screen, that is, when the light is white light, the power consumption is the lowest, and when the light is purple light, the power consumption is the highest, which greatly enhances the training effect and significantly improves the accuracy of the temperature measurement of the liquid crystal display screen.

[0064] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects.

[0065] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A real-time temperature detection device for a liquid crystal display screen, characterized in that: It includes a thermal imager for obtaining a thermal imaging image of a liquid crystal display; a CCD camera for obtaining a real-time video frame image of the liquid crystal display; an embedded processing system temperature calculation module for obtaining the operating temperature T of the corresponding pixel position of the liquid crystal display according to the thermal imaging image and the real-time video frame image; and outputting the temperature of the nth block of the liquid crystal display, wherein the temperature of the nth block is the average value of the sum of the corresponding temperatures of all pixels in the block; wherein the calculation process of the operating temperature T is as follows: T=αT1+βT2 T1=T a +R th *P*γ Wherein, T1 is the first temperature determined by the CCD camera and the luminous power consumption of the LCD screen, T2 is the second temperature of the acquired thermal imaging image pixel, R th is the thermal resistance between the LCD screen and the air environment, P is the power consumption, γ is the luminous color value coefficient at the pixel position (i, j) of the video frame image; H represents the gray value at the position (p1, p2) of the thermal imaging image, τ is the atmospheric infrared transmittance; α and β are the proportional coefficients of the temperature values ​​of the thermal imager and the CCD camera, respectively, where α+β=1; Where k is the slope of the linear segment of the response curve, ∈ is the specific emissivity of the entire spectral range of the target material; A s is the area of ​​the target small facet; A0 is the incident pupil area in the receiving system; l is the distance between the LCD screen and the thermal imager; θ s and θ0 are the angles between a point on the small facet and the center of the incident pupil and the normal direction of the small facet and the axis direction of the optical system, respectively, and C is a constant.

2. A device for real-time temperature detection of a liquid crystal display screen according to claim 1, characterized in that: The γ is the luminous color value coefficient, which is specifically expressed as: γ=k1R+k2G+k3B R is the R channel value of the RGB image obtained by the CCD camera, G is the G channel value of the RGB image obtained by the CCD camera, B is the B channel value of the RGB image obtained by the CCD camera, k1, k2, and k3 represent the weight coefficients of the R channel value, the G channel value, and the B channel value, respectively. The power consumption is lowest when the light is white light, and the power consumption is highest when the light is purple light.

3. A device for real-time temperature detection of a liquid crystal display screen according to claim 1, characterized in that: The CCD camera is connected to the embedded system via the processor interface MIPI.

4. A device for real-time temperature detection of a liquid crystal display screen according to claim 1, characterized in that: After the CCD camera is used to acquire the real-time video frame image of the liquid crystal display screen, the method also includes performing Gaussian filtering on the acquired video frame image.

5. A device for real-time temperature detection of a liquid crystal display screen according to claim 1, characterized in that: The thermal imager is an X384 infrared thermal imager, which is used to obtain thermal imaging images of the liquid crystal display screen.

6. A control method for a real-time temperature detection device for a liquid crystal display, characterized in that: The method comprises the following steps: S1: turning on a thermal imager, setting the distance between a liquid crystal display screen and the thermal imager to be l, and obtaining a thermal imaging image of the liquid crystal display screen; S2: turning on a CCD camera to obtain a real-time video frame image of the liquid crystal display screen; S3: a temperature calculation module of an embedded processing system, obtaining a working temperature T of a corresponding pixel position of the liquid crystal display screen according to the thermal imaging image and the real-time video frame image; S4: outputting and displaying the temperature of the nth block of the liquid crystal display screen, wherein the temperature of the nth block is the average value of the sum of the temperatures corresponding to all pixels of the block; wherein the calculation process of the working temperature T is as follows: T=αT1+βT2 T1=T a +R th *P*γ Wherein, T1 is the first temperature determined by the CCD camera and the luminous power consumption of the LCD screen, T2 is the second temperature of the acquired thermal imaging image pixel, R th is the thermal resistance between the LCD screen and the air environment, P is the power consumption, γ is the luminous color value coefficient at the pixel position (i, j) of the video frame image; H represents the gray value at the position (p1, p2) of the thermal imaging image, τ is the atmospheric infrared transmittance; α and β are the proportional coefficients of the temperature values ​​of the thermal imager and the CCD camera, respectively, where α+β=1; Where k is the slope of the linear segment of the response curve, ∈ is the specific emissivity of the entire spectral range of the target material; A s is the area of ​​the target small facet; A0 is the incident pupil area in the receiving system; l is the distance between the LCD screen and the thermal imager; θ s and θ0 are the angles between a point on the small facet and the center of the incident pupil and the normal direction of the small facet and the axis direction of the optical system, respectively, and C is a constant.

7. A control method for a real-time temperature detection device for a liquid crystal display screen according to claim 6, characterized in that: The γ is the luminous color value coefficient, which is specifically expressed as: γ=k1R+k2G+k3B R is the R channel value of the RGB image obtained by the CCD camera, G is the G channel value of the RGB image obtained by the CCD camera, B is the B channel value of the RGB image obtained by the CCD camera, k1, k2, and k3 represent the weight coefficients of the R channel value, the G channel value, and the B channel value, respectively. The power consumption is lowest when the light is white light, and the power consumption is highest when the light is purple light.

8. A control method for a real-time temperature detection device for a liquid crystal display screen according to claim 6, characterized in that: The CCD camera is connected to the embedded system via the processor interface MIPI.

9. A control method for a real-time temperature detection device for a liquid crystal display screen according to claim 6, characterized in that: After the CCD camera is used to obtain the real-time video frame image of the liquid crystal display screen, the method also includes performing Gaussian filtering on the obtained video frame image.

10. A control method for a real-time temperature detection device for a liquid crystal display screen according to claim 6, characterized in that: The thermal imager is an X384 infrared thermal imager, which is used to obtain thermal imaging images of the liquid crystal display screen.

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