Method for controlling peak brightness and backlight system temperature of liquid crystal display television, storage medium and television

Abstract

The invention relates to a liquid crystal display television control technology, and discloses a method for controlling the peak brightness and the backlight system temperature of a liquid crystal display television, a storage medium and a television, which are used for controlling the peak brightness and the backlight system temperature of a backlight system of the liquid crystal display television and ensuring the reliability of a product. According to the method, a temperature control curve is obtained by establishing the relation between temperature and backlight partition control current, and weighting coefficients corresponding to different temperature values are set; when the liquid crystal display television works, whether temperature control is started or not is determined by comparing a current value calculated by adopting a traditional backlight control curve with a preset current threshold value: when the current value does not exceed the current threshold value, the current value calculated by adopting the traditional backlight control curve is directly used as a control current; and when the current value exceeds the current threshold value, starting temperature control, and carrying out weighted calculation on the backlight control curve and a pre-established temperature control curve by adopting a weighting coefficient corresponding to the current temperature value so as to calculate the control current. Therefore, the peak brightness and the backlight system temperature are controlled by dynamically adjusting the partition control current.

Description

Technical Field

[0001] The invention relates to a liquid crystal television control technology, and in particular to a control method for a liquid crystal television peak brightness and backlight system temperature, a storage medium and a television. Background Art

[0002] At present, for LCD TVs with zoned light control, the overall backlight power is generally the largest under full white field, and then under different window sizes and different grayscale signals, the overall backlight power does not exceed the overall power of the full white field, and does not exceed the current that the light bar can withstand, so the backlight current is increased as much as possible to improve the display brightness; however, if it is in a small window with high grayscale for a long time, the local zone power is always at a large value, which will cause the temperature to rise, which may exceed the temperature that the diaphragm in the backlight system can withstand, causing the diaphragm to burn. This phenomenon has a certain impact on product reliability. In order to ensure product reliability, it is particularly important to control the peak brightness and temperature of the LCD TV backlight system. Summary of the invention

[0003] The technical problem to be solved by the present invention is to propose a control method for the peak brightness and backlight system temperature of a liquid crystal television, a storage medium and a television set, so as to control the peak brightness and backlight system temperature of the liquid crystal television backlight system and ensure the reliability of the product.

[0004] The technical solution adopted by the present invention to solve the above technical problems is:

[0005] In one aspect, the present invention provides a method for controlling the peak brightness and backlight system temperature of a liquid crystal television, which is applied to a liquid crystal television with zone light control, wherein a plurality of temperature sensors are arranged on the back panel of the liquid crystal television, and the method comprises:

[0006] Set the backlight partitions controlled by each temperature sensor;

[0007] Establish the relationship between temperature and backlight partition control current to obtain the temperature control curve;

[0008] Set the weighting coefficients corresponding to different temperature values;

[0009] When the LCD TV is working, each temperature sensor transmits the real-time collected temperature value to the TV processor. During the control process, the processor controls the current size of each partition for each frame of the TV screen in the following way:

[0010] Use the traditional backlight control curve to calculate the control current I of each partition j , I j represents the control current of the jth partition and is compared with the preset current threshold α. If it is less than or equal to α, I jas the current control current of the corresponding partition;

[0011] If I j If it is greater than α, the weighted coefficient corresponding to the current temperature value of each partition is used to calculate I j And the current value calculated according to the temperature control curve is weighted to obtain I' j , as the current control current of the corresponding partition.

[0012] Furthermore, the plurality of temperature sensors are distributed on the back panel of the LCD TV.

[0013] Furthermore, the backlight partitions controlled by the temperature sensors are set according to the distribution positions of the temperature sensors on the back panel of the LCD TV.

[0014] Furthermore, the relationship between temperature and backlight partition control current is established through experimental verification.

[0015] Furthermore, the temperature control curve is a segmented curve. When the temperature is lower than the first threshold, the corresponding current value is a higher value. When the temperature is between the first threshold and the second threshold, the corresponding current value decreases. When the temperature is higher than the second threshold, the corresponding current value is a lower value.

[0016] Furthermore, the weighting coefficients corresponding to different temperature values ​​are set through experimental verification, and the value range of the weighting coefficient is 0 to 1. The higher the temperature, the greater the weighting coefficient.

[0017] Furthermore, the weighted coefficients corresponding to the current temperature values ​​of each partition are used to calculate I j And the current value calculated according to the temperature control curve is weighted to obtain I' j The calculation methods include:

[0018] I' j =(1-β j )*I j +β j *I t

[0019] Among them, β j is the weighted coefficient corresponding to the current temperature value of the jth partition, I t is the current value calculated according to the temperature control curve.

[0020] Furthermore, the current temperature value of each partition refers to the current temperature value collected by the sensor corresponding to each partition.

[0021] In a second aspect, the present invention further provides a storage medium storing a computer program, which, when executed by a processor, implements the method for controlling the peak brightness and backlight system temperature of a liquid crystal television as described above.

[0022] In a third aspect, the present invention further provides a television set, comprising a processor and a memory, wherein the memory stores a computer program, and the processor implements the above-mentioned method for controlling the peak brightness and backlight system temperature of the LCD television by executing the computer program.

[0023] The beneficial effects of the present invention are:

[0024] Based on the scheme of the present invention, the current value calculated by the traditional backlight control curve is compared with the preset current threshold to determine whether to turn on the temperature control: when the current threshold is not exceeded, the current value calculated by the traditional backlight control curve is directly used as the control current; when the current threshold is exceeded, the temperature control is turned on, and the backlight control curve and the pre-established temperature control curve are weighted by using the weighting coefficient corresponding to the current temperature value to calculate the control current. In this way, the peak brightness and the backlight system temperature are controlled by dynamically adjusting the partition control current, thereby avoiding the situation where the diaphragm is burned due to the continuous increase in the backplane partition temperature exceeding the temperature that the diaphragm in the backlight system can withstand, thereby ensuring the product reliability of the LCD TV. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the distribution of temperature sensors on the backplane in an embodiment of the present invention;

[0026] Figure 2 is a temperature control curve diagram in an embodiment of the present invention;

[0027] Figure 3 is a weighted coefficient curve diagram in an embodiment of the present invention;

[0028] Figure 4 The figure is a control process flow chart of the peak brightness and backlight system temperature of the LCD TV in the embodiment of the present invention. DETAILED DESCRIPTION

[0029] The present invention aims to provide a control method for the peak brightness and backlight system temperature of a liquid crystal television, a storage medium and a television set, which control the peak brightness and backlight system temperature of the liquid crystal television backlight system to ensure the reliability of the product. The core idea is: considering the backlight system temperature, multiple temperature sensors are set on the back panel of the liquid crystal television, each temperature sensor corresponds to one or more partitions, so that the detected temperature is used as the current temperature value of the corresponding partition; and through experimental verification, the relationship between the temperature and the backlight partition control current is established, the temperature control curve is obtained, and the weighting coefficient corresponding to different temperature values ​​is set through experimental verification; when the liquid crystal television is working, the current value calculated by using the traditional backlight control curve is compared with the preset current threshold to determine whether to turn on the temperature control: when the current threshold is not exceeded, the current value calculated by the traditional backlight control curve is directly used as the control current; when the current threshold is exceeded, the temperature control is turned on, and the backlight control curve and the pre-established temperature control curve are weighted by using the weighting coefficient corresponding to the current temperature value to calculate the control current. In this way, the peak brightness and backlight system temperature can be controlled by dynamically adjusting the partition control current, avoiding the situation where the backplane partition temperature continues to rise and exceeds the temperature that the diaphragm in the backlight system can withstand, causing the diaphragm to burn out, thereby ensuring the product reliability of the LCD TV.

[0030] The scheme of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0031] Example

[0032] This embodiment takes the implementation of the present invention on a liquid crystal television with 30*18=540 partitions as an example, and the implementation process is as follows:

[0033] Multiple temperature sensors for collecting temperature are arranged on the backplane. Considering the cost and processor performance, one temperature sensor corresponds to multiple partitions. That is, when using temperature data, the temperature value collected by the sensor is used as the temperature value of each partition controlled by the sensor. The arrangement method can be set according to actual needs. For example, more dense sensors are arranged in key areas such as the center of the screen, while relatively sparse sensors are arranged in other areas. Of course, a simple arrangement method is uniform arrangement. For an exemplary method, see Figure 1 , by evenly arranging 9 temperature sensors to collect the corresponding partition temperatures, each sensor is responsible for 60 partitions, for example: from left to right, from top to bottom, the partitions controlled by the first temperature sensor are 60 partitions in the intersection area of ​​the first to sixth rows and the first to tenth columns.

[0034] Then, it is necessary to establish the relationship between temperature and backlight partition control current through experimental verification means to obtain a temperature control curve. An exemplary temperature control curve is as follows: Figure 2As shown, when the temperature is lower than 40°C, the corresponding current is 45mA, and when the temperature is higher than 60°C, the corresponding current is 25mA. When the temperature is between 40°C and 60°C, the corresponding current decreases linearly, that is, the higher the temperature, the smaller the control current.

[0035] In addition, it is necessary to establish weighting coefficients corresponding to different temperatures through experimental verification to obtain a weighting coefficient curve. An exemplary weighting coefficient curve is shown in Figure 3 The value range of the weighting coefficient is 0 to 1. The higher the temperature, the greater the weighting coefficient.

[0036] Finally, you need to set a current threshold α. When setting it, you need to consider the brightness of the final screen presented by the whole machine and whether the backlight temperature will eventually exceed the standard. If it is set too high, the temperature control effect may be poor and the temperature may be too high. On the contrary, if it is set too low, the scene that does not require temperature control intervention may also be temperature controlled, making the final brightness of the screen too dark. Therefore, you can set a reasonable threshold based on experiments.

[0037] After completing the above work, during the TV operation, the data processing flow is as follows Figure 4 , each temperature sensor transmits the real-time collected temperature value to the TV processor. During the control process, the processor controls the current size of each partition for each frame of the TV screen in the following way:

[0038] Use the traditional backlight control curve to calculate the control current I of each partition j , I j represents the control current of the jth partition and is compared with the preset current threshold α:

[0039] If I j ≤α, then I j As the current control current I' of the corresponding partition j , i.e. I' j =I j ;

[0040] If I j >α, then the weighted coefficient corresponding to the current temperature value of each partition is used to calculate I j And the current value calculated according to the temperature control curve is weighted to obtain I' j , that is: I' j =(1-β j )*I j +β j *I t ;

[0041] Among them, β j is the weighted coefficient corresponding to the current temperature value of the jth partition, I tis the current value calculated according to the temperature control curve.

[0042] Taking the backlight control of a certain partition as an example, the current threshold α is set to 25mA. The temperature sensor collects the temperature of the corresponding backlight system at 60Hz and feeds it back to the processor. The processor first calculates I according to the traditional backlight control curve. j , if I j =20mA, which is less than the threshold value α=25mA, then there is no need to start the temperature control curve, I' j =20mA;

[0043] If I j =30mA, the current temperature of the partition is 40℃, then due to I j >α, the temperature control curve needs to be involved. The corresponding current value on the temperature control curve is 45mA. In addition, the weighting coefficient β corresponding to 40℃ on the weighting coefficient curve j =0, then:

[0044] I' j =(1-0)*30+0*45=30mA

[0045] If I j =40mA, the current temperature of the partition is 50℃, then due to I j >α, the temperature control curve needs to be involved. The corresponding current value on the temperature control curve is 35mA. In addition, the weighting coefficient β corresponding to 40℃ on the weighting coefficient curve j =0.5, then:

[0046] I' j =(1-0.5)*40+0.5*35=37.5mA

[0047] Therefore, the present invention can realize dynamic adjustment of the partition control current, thereby preventing the back panel partition temperature from continuously rising and exceeding the temperature that the diaphragm in the backlight system can withstand, causing the diaphragm to burn out, thereby ensuring the product reliability of the LCD TV.

[0048] Finally, it should be noted that the above embodiments are only preferred implementations and are not intended to limit the present invention. It should be pointed out that for those skilled in the art, several modifications, equivalent replacements, improvements, etc. can be made without departing from the scope of the present invention and the scope of protection of the claims, and all of these should be included in the protection scope of the present invention.

Claims

1. A method for controlling the peak brightness and backlight system temperature of a liquid crystal television, applied to a liquid crystal television with zone light control, characterized in that: A plurality of temperature sensors are arranged on the back plate of the liquid crystal television, and the method comprises: Set the backlight partitions controlled by each temperature sensor; Establish the relationship between temperature and backlight partition control current to obtain the temperature control curve; Set the weighting coefficients corresponding to different temperature values; When the LCD TV is working, each temperature sensor transmits the real-time collected temperature value to the TV processor. During the control process, the processor controls the current size of each partition for each frame of the TV screen in the following way: Use the traditional backlight control curve to calculate the control current I of each partition j , I j represents the control current of the jth partition and is compared with the preset current threshold α. If it is less than or equal to α, I j as the current control current of the corresponding partition; If I j If it is greater than α, the weighted coefficient corresponding to the current temperature value of each partition is used to calculate I j And the current value calculated according to the temperature control curve is weighted to obtain I′ j , as the current control current of the corresponding partition.

2. The method for controlling the peak brightness and backlight system temperature of a liquid crystal television according to claim 1, characterized in that: The multiple temperature sensors are distributed on the back panel of the LCD TV.

3. The method for controlling the peak brightness and backlight system temperature of a liquid crystal television according to claim 1, characterized in that: The backlight partitions controlled by the temperature sensors are set according to the distribution positions of the temperature sensors on the back panel of the liquid crystal television.

4. The method for controlling the peak brightness and backlight system temperature of a liquid crystal television according to claim 1, characterized in that: The relationship between temperature and backlight partition control current is established through experimental verification.

5. The method for controlling the peak brightness and backlight system temperature of a liquid crystal television according to claim 4, characterized in that: The temperature control curve is a segmented curve. When the temperature is lower than the first threshold, the corresponding current value is a higher value. When the temperature is between the first threshold and the second threshold, the corresponding current value decreases. When the temperature is higher than the second threshold, the corresponding current value is a lower value.

6. The method for controlling the peak brightness and backlight system temperature of a liquid crystal television according to claim 5, characterized in that: The weighting coefficients corresponding to different temperature values ​​are set by experimental verification. The value range of the weighting coefficient is 0 to 1. The higher the temperature, the greater the weighting coefficient.

7. The method for controlling the peak brightness and backlight system temperature of a liquid crystal television according to claim 6, characterized in that: According to the weighted coefficient corresponding to the current temperature value of each partition, I j And the current value calculated according to the temperature control curve is weighted to obtain I′ j The calculation methods include: I j =(1-β j )*I j +b j *l t Among them, β j is the weighted coefficient corresponding to the current temperature value of the jth partition, I t is the current value calculated according to the temperature control curve.

8. The method for controlling the peak brightness and backlight system temperature of a liquid crystal television according to any one of claims 1 to 7, characterized in that: The current temperature value of each partition refers to the current temperature value collected by the sensor corresponding to each partition.

9. A storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method for controlling the peak brightness and backlight system temperature of a liquid crystal television as claimed in any one of claims 1 to 8 is implemented.

10. A television set comprising a processor and a memory, wherein a computer program is stored in the memory, wherein: The processor implements the method for controlling the peak brightness and backlight system temperature of a liquid crystal television as described in any one of claims 1 to 8 by executing the computer program.

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