Display control circuit and display device

Abstract

The invention provides a display control circuit and a display device. The display control circuit comprises a light-emitting assembly, a temperature detection device and a control circuit. The temperature detection device is used for detecting the working temperature of the light-emitting assembly. The control circuit is electrically connected with the light-emitting assembly and the temperature detection device and used for outputting a driving signal which is used for controlling the light-emitting assembly to emit light. The control circuit is also used for adjusting the driving signal according to the working temperature; and when the working temperature is greater than the preset temperature, the current of the driving signal is in positive correlation with the working temperature. The working temperature of the light-emitting component is detected through the temperature detection device, and the driving signal is adjusted through the control circuit according to the working temperature of the light-emitting component, so that the current of the driving signal is increased along with the increase of the working temperature, color cast caused by temperature rise of the light-emitting component is corrected, color development of the light-emitting component is stable, and the service life of the light-emitting component is prolonged. The reliability of the light-emitting assembly is improved.

Description

Technical Field

[0001] The present application relates to the field of display, and in particular to a display control circuit and a display device. Background Art

[0002] At present, LED chips are usually used in display devices to realize image display. LED chips have many advantages such as high color gamut, high brightness, long life, energy saving and environmental protection, and adjustable color. High color gamut LED chips are widely used in electronic products such as televisions, mobile phones, and tablets, making their screen colors more vivid and the color reproduction higher.

[0003] We usually describe luminescent materials by luminescent color. Due to psychological and physiological influences, people's perception of color is not exactly the same. Even normal vision is not exactly the same. To quantitatively describe a color and use physical methods instead of human eyes to measure color, we need to use chromaticity diagrams (such as Figure 1 The ambient temperature will affect the color of the LED chip. When the temperature rises, the x and y coordinates of the LED chip in the chromaticity diagram will shift, resulting in a deviation in the final color. Summary of the invention

[0004] In order to solve the problems in the prior art, the present application provides a display control circuit and a display device to improve the reliability of light-emitting components.

[0005] The present application provides a display control circuit, the display control circuit comprising: Light emitting components; A temperature detection device, used to detect the operating temperature of the light-emitting component; A control circuit is electrically connected to the light-emitting component and the temperature detection device, respectively, and is used to output a drive signal, wherein the drive signal is used to control the light-emitting component to emit light; the control circuit is also used to adjust the drive signal according to the operating temperature; when the operating temperature is greater than a preset temperature, the current of the drive signal is positively correlated with the operating temperature.

[0006] In one embodiment, the control circuit is further configured to adjust the driving signal based on a preset temperature-current mapping table; the temperature-current mapping table includes currents of the driving signal corresponding to different operating temperatures.

[0007] In one embodiment, the number of the light emitting components is one or more.

[0008] In one embodiment, there are multiple light-emitting components, and each of the light-emitting components includes one or more light-emitting elements; The plurality of light-emitting components are electrically connected to the control circuit respectively; the control circuit is used to output multiple driving signals, and each driving signal is used to control one of the light-emitting components to emit light.

[0009] In one embodiment, there are multiple light-emitting components, each of which includes one or more light-emitting elements; the multiple light-emitting components are electrically connected to the control circuit, and the control circuit is used to output a drive signal, and the drive signal is used to control the multiple light-emitting components to emit light separately.

[0010] In one embodiment, the light emitting assembly includes a plurality of first light emitting elements and a plurality of second light emitting elements; the type of the first light emitting elements is different from the type of the second light emitting elements; The control circuit is electrically connected to the first light-emitting element and the second light-emitting element respectively; the control circuit is used to output a first drive signal and a second drive signal; the first drive signal is used to control the first light-emitting element to emit light, and the second drive signal is used to control the second light-emitting element to emit light; the control circuit is also used to adjust the first drive signal and the second drive signal according to the operating temperature; the current of the first drive signal and the current of the second drive signal are both positively correlated with the operating temperature.

[0011] In one embodiment, the light emitting element includes at least one of a blue light chip, a green light chip, and a blue-green chip.

[0012] In one embodiment, the display control circuit further includes a driving circuit; The driving circuit is electrically connected to the light emitting component and the control circuit respectively, and the driving circuit is used to output the driving signal based on the control of the control circuit.

[0013] In one embodiment, the display control circuit further includes a filtering circuit; The filter circuit is electrically connected to the temperature detection device and the control circuit respectively; the filter circuit is used to filter the detection signal output by the temperature detection device and then output it to the control circuit.

[0014] The present application also proposes a display device, which includes the above-mentioned display control circuit.

[0015] The present application detects the operating temperature of the light-emitting component through a temperature detection device, and adjusts the driving signal according to the operating temperature of the light-emitting component through a control circuit, so that the current of the driving signal increases with the increase of the operating temperature, thereby correcting the color deviation of the light-emitting component caused by temperature rise, making the color rendering of the light-emitting component stable, and improving the reliability of the light-emitting component. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a chromaticity diagram used in the prior art to describe colors.

[0017] Figure 2 Schematic diagram of the module structure of an embodiment of the display control circuit of the present application.

[0018] Figure 3 FIG. 1 is a schematic diagram showing how the color coordinates of a blue-green chip vary with temperature in an embodiment of the present application.

[0019] Figure 4 FIG. 1 is a schematic diagram showing how the color coordinates of a blue-green chip vary with current in an embodiment of the present application.

[0020] Figure 5 It is a structural diagram of an embodiment of a display control circuit of the present application.

[0021] Figure 6 FIG. 4 is a schematic diagram of the structure of another embodiment of the display control circuit of the present application.

[0022] Figure 7 It is a structural diagram of another embodiment of the display control circuit of the present application.

[0023] Explanation of the main component symbols: display control circuit-100; light-emitting component-110; temperature detection device-120; control circuit-130; light-emitting element-111; first light-emitting element-112; second light-emitting element-113; driving circuit-140; filtering circuit-150.

[0024] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0025] The following description will refer to the accompanying drawings to more fully describe the content of the present application. Shown in the accompanying drawings are exemplary embodiments of the present application. However, the present application can be implemented in many different forms and should not be construed as being limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make the present application thorough and complete, and to fully convey the scope of the present application to those skilled in the art. Similar reference numerals represent identical or similar components.

[0026] The terms used herein are only used for the purpose of describing specific exemplary embodiments and are not intended to limit the present application. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to also include the plural forms. In addition, when used herein, "including" and / or "comprising" and / or "having", integers, steps, operations, components and / or components, but do not exclude the existence or addition of one or more other features, regions, integers, steps, operations, components and / or groups thereof.

[0027] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs. In addition, unless explicitly defined herein, terms such as those defined in general dictionaries should be interpreted as having a meaning consistent with their meaning in the relevant technology and the content of this application, and will not be interpreted as an idealized or overly formal meaning.

[0028] The following will describe exemplary embodiments in conjunction with the accompanying drawings. It should be noted that the components depicted in the reference drawings are not necessarily shown to scale; and the same or similar components will be given the same or similar reference numerals or similar technical terms.

[0029] Reference Figure 2 The present application proposes a display control circuit 100, which includes a light-emitting component 110, a temperature detection device 120 and a control circuit 130. The temperature detection device 120 is used to detect the operating temperature of the light-emitting component 110. The control circuit 130 is electrically connected to the light-emitting component 110 and the temperature detection device 120, respectively, and is used to output a driving signal, and the driving signal is used to control the light-emitting component 110 to emit light; the control circuit 130 is also used to adjust the driving signal according to the operating temperature; when the operating temperature is greater than a preset temperature, the current of the driving signal is positively correlated with the operating temperature.

[0030] In this embodiment, the temperature detection device 120 can be implemented by a temperature sensor. The temperature detection device 120 can be arranged close to the light emitting component 110. The control circuit 130 can be implemented by a chip with control function such as a microprocessor or FPGA. The driving signal can be a PWM / PAM signal.

[0031] The light emitting component 110 generates heat when working, causing the temperature to rise. The light emitting component 110 itself may also work in a high temperature environment. When the temperature rises to a preset temperature, the color coordinates of the light emitting color of the light emitting component 110 will shift. Figure 3 As shown, taking the blue-green chip as an example, when the temperature rises from 25° to 80°, the x coordinate in the color coordinate will fluctuate within a smaller range, and the y coordinate will shift upward. The color coordinate shifts from the blue area to the green area, resulting in a deviation in the color presented by the light-emitting component 110.

[0032] In addition, the current of the driving signal will also affect the light color of the light emitting component 110. Figure 4As shown, taking the blue-green chip as an example, when the current increases from 5mA to 30mA, the x coordinate in the color coordinate will fluctuate within a small range, and the y coordinate will shift downward. By utilizing the opposite characteristics of the effects of temperature increase and current increase on the y coordinate, the control circuit 130 can control the current of the driving signal to increase with the increase in the operating temperature according to the operating temperature of the light-emitting component 110, thereby correcting the y coordinate. For example, when the temperature rises from 25° to 45°, the y coordinate shifts upward, and the current of the driving signal can be increased from 5mA to 10mA, so that the y coordinate shifts downward again, thereby correcting the y coordinate.

[0033] In one embodiment, the control circuit 130 is further configured to adjust the driving signal based on a preset temperature-current mapping table; the temperature-current mapping table includes currents of the driving signal corresponding to different operating temperatures.

[0034] In this embodiment, the temperature-current mapping table can be obtained by testing the light emitting component 110. At multiple operating temperatures greater than the preset temperature, the current of the appropriate driving signal is determined by testing, so that the color deviation of the light emitting component 110 caused by the temperature rise can be corrected by the driving signal.

[0035] Furthermore, the ratio of the current of the driving signal to the change in the operating temperature can be determined based on actual measurement data. Taking the blue-green chip as an example, when the temperature is greater than the preset temperature, the change value of the y coordinate is approximately -0.01 / 10°. When the current increases, the change value of the y coordinate is 0.01 / 5mA. Therefore, the control circuit 130 can adjust the driving signal based on the current of the driving signal increasing by 5mA for every 10° increase in the operating temperature.

[0036] In one embodiment, the number of the light emitting components 110 is one or more. The control circuit 130 can output multiple driving signals to each light emitting component 110 respectively or output one driving signal to multiple light emitting components 110 at the same time to adjust the color coordinate offset of the light emitting element 111. The light emitting element 111 can be any one of a blue chip, a green chip, or a blue-green chip.

[0037] Reference Figure 5 In one embodiment, there are multiple light-emitting components 110, and each light-emitting component 110 includes one or more light-emitting elements 111. The multiple light-emitting components 110 are electrically connected to the control circuit 130 respectively; the control circuit 130 is used to output multiple driving signals, and each driving signal is used to control one of the light-emitting components 110 to emit light.

[0038] In this embodiment, the control circuit 130 can also output multiple driving signals to control the multiple light-emitting components 110 respectively, so as to achieve precise adjustment of each light-emitting component 110. For example, when the types of the light-emitting elements 111 in the multiple light-emitting components 110 are different, the control circuit 130 can adjust the corresponding driving signals according to the characteristics of the different types of light-emitting elements 111. Furthermore, the temperature detection device 120 can also be set to multiple according to the number of light-emitting components 110. The light-emitting element 111 can be any one of a blue chip, a green chip, and a blue-green chip.

[0039] Reference Figure 6 In one embodiment, there are multiple light-emitting components 110, and each of the light-emitting components 110 includes one or more light-emitting elements 111; the multiple light-emitting components 110 are electrically connected to the control circuit 130, and the control circuit 130 is used to output a driving signal, and the driving signal is used to control the multiple light-emitting components 110 to emit light separately.

[0040] In this embodiment, the control circuit 130 can adjust multiple light-emitting components 110 at the same time by outputting a driving signal. In this way, the circuit wiring can be simplified and the circuit layout is convenient. The light-emitting element 111 in the light-emitting component 110 can be any one of a blue chip, a green chip, and a blue-green chip.

[0041] Reference Figure 7 In one embodiment, the light emitting assembly 110 includes a plurality of first light emitting elements 112 and a plurality of second light emitting elements 113; the type of the first light emitting element 112 is different from the type of the second light emitting element 113. The control circuit 130 is electrically connected to the first light emitting element 112 and the second light emitting element 113 respectively; the control circuit 130 is used to output a first driving signal and a second driving signal; the first driving signal is used to control the first light emitting element 112 to emit light, and the second driving signal is used to control the second light emitting element 113 to emit light; the control circuit 130 is also used to adjust the first driving signal and the second driving signal according to the operating temperature; the current of the first driving signal and the current of the second driving signal are both positively correlated with the operating temperature.

[0042] In this embodiment, different types of light-emitting elements 111 have different driving voltages, and the control circuit 130 can output the first driving signal and the second driving signal to the first light-emitting element 112 and the second light-emitting element 113, respectively, to drive the first light-emitting element 112 and the second light-emitting element 113 to emit appropriate color light, and adjust the first driving signal and the second driving signal according to the characteristics of the first light-emitting element 112 and the second light-emitting element 113, so as to achieve precise adjustment of the first light-emitting element 112 and the second light-emitting element 113. The light-emitting element 111 can be any one of a blue light chip, a green light chip, and a blue-green chip. Furthermore, the number of the temperature detection device 120 can be set to two, so as to detect the operating temperature of the first light-emitting element 112 and the operating temperature of the second light-emitting element 113, respectively, so that the circuit can more accurately adjust the first driving signal and the second driving signal.

[0043] In one embodiment, the display control circuit 100 further includes a driving circuit 140. The driving circuit 140 is electrically connected to the light emitting component 110 and the control circuit 130 respectively, and the driving circuit 140 is used to output the driving signal based on the control of the control circuit 130.

[0044] In this embodiment, the driving circuit 140 can be implemented by a transistor, a rectifier bridge, a resistor, a capacitor, etc. The control signal can be a PAM / PWM signal. The control circuit 130 can adjust the duty cycle of the control signal to adjust the driving signal.

[0045] In one embodiment, the display control circuit 100 further includes a filter circuit 150. The filter circuit 150 is electrically connected to the temperature detection device 120 and the control circuit 130 respectively; the filter circuit 150 is used to filter the detection signal output by the temperature detection device 120 and output it to the control circuit 130.

[0046] In this embodiment, the filter circuit 150 can be implemented by capacitors and resistors. The filter circuit 150 filters the detection signal output by the temperature detection device 120, so that the control circuit 130 receives a more accurate detection signal, so as to accurately adjust the driving signal.

[0047] In one embodiment, the display control circuit 100 further includes a heat dissipation component. The control circuit 130 is also used to control the heat dissipation component to dissipate heat when the operating temperature is greater than a preset temperature, thereby reducing the operating temperature of the light emitting component 110 to reduce the impact of the continuous temperature increase on the light emitting component 110.

[0048] In one embodiment, the control circuit 130 is further configured to collect a detection signal output by the temperature detection device 120 at a preset time interval, and determine the current operating temperature of the light-emitting component 110 according to a voltage of the detection signal.

[0049] In this embodiment, the preset time interval can be set according to actual application, for example, set to 3 minutes, 5 minutes, etc. In this way, the operating temperature of the light emitting component 110 can be detected in time and the power consumption can be reduced.

[0050] The present application detects the operating temperature of the light-emitting component 110 through a temperature detection device 120, and adjusts the driving signal according to the operating temperature of the light-emitting component 110 through a control circuit 130, so that the current of the driving signal increases with the increase of the operating temperature, thereby correcting the color deviation of the light-emitting component 110 caused by temperature rise, making the color rendering of the light-emitting component 110 stable, and improving the reliability of the light-emitting component 110.

[0051] The present application also proposes a display device, which includes the above-mentioned display control circuit 100. The display device can be a TV screen, a computer monitor, a mobile phone screen, etc.

[0052] The detailed structure of the display control circuit 100 can be referred to the above-mentioned embodiment, which will not be described in detail here; it can be understood that since the above-mentioned display control circuit 100 is used in the display device of the present application, the embodiment of the display device of the present application includes all technical solutions of all embodiments of the above-mentioned display control circuit 100, and the technical effects achieved are also exactly the same, which will not be described in detail here.

[0053] In the above, the specific implementation of the present application is described with reference to the accompanying drawings. However, those skilled in the art will appreciate that various changes and substitutions may be made to the specific implementation of the present application without departing from the spirit and scope of the present application. These changes and substitutions are all within the scope defined by the present application.

Claims

1. A display control circuit, characterized in that: The display control circuit comprises: Light emitting components; A temperature detection device, used to detect the operating temperature of the light-emitting component; A control circuit is electrically connected to the light-emitting component and the temperature detection device, respectively, and is used to output a drive signal, wherein the drive signal is used to control the light-emitting component to emit light; the control circuit is also used to adjust the drive signal according to the operating temperature; when the operating temperature is greater than a preset temperature, the current of the drive signal is positively correlated with the operating temperature.

2. The display control circuit according to claim 1, characterized in that: The control circuit is further used to adjust the driving signal based on a preset temperature-current mapping table; the temperature-current mapping table includes currents of the driving signal corresponding to different operating temperatures.

3. The display control circuit according to claim 1, characterized in that: The number of the light emitting components is one or more.

4. The display control circuit according to claim 3, characterized in that: There are multiple light-emitting components, and each of the light-emitting components includes one or more light-emitting elements; The plurality of light-emitting components are electrically connected to the control circuit respectively; the control circuit is used to output multiple driving signals, and each driving signal is used to control one of the light-emitting components to emit light.

5. The display control circuit according to claim 3, characterized in that: There are multiple light-emitting components, each of which includes one or more light-emitting elements; the multiple light-emitting components are electrically connected to the control circuit, and the control circuit is used to output a driving signal, and the driving signal is used to control the multiple light-emitting components to emit light separately.

6. The display control circuit according to claim 3, characterized in that: The light-emitting assembly includes a plurality of first light-emitting elements and a plurality of second light-emitting elements; the types of the first light-emitting elements are different from the types of the second light-emitting elements; The control circuit is electrically connected to the first light-emitting element and the second light-emitting element respectively; the control circuit is used to output a first drive signal and a second drive signal; the first drive signal is used to control the first light-emitting element to emit light, and the second drive signal is used to control the second light-emitting element to emit light; the control circuit is also used to adjust the first drive signal and the second drive signal according to the operating temperature; the current of the first drive signal and the current of the second drive signal are both positively correlated with the operating temperature.

7. The display control circuit according to any one of claims 3 to 6, characterized in that: The light emitting element includes at least one of a blue light chip, a green light chip, and a blue-green chip.

8. The display control circuit according to claim 1, characterized in that: The display control circuit also includes a driving circuit; The driving circuit is electrically connected to the light emitting component and the control circuit respectively, and the driving circuit is used to output the driving signal based on the control of the control circuit.

9. The display control circuit according to claim 1, characterized in that: The display control circuit also includes a filter circuit; The filter circuit is electrically connected to the temperature detection device and the control circuit respectively; the filter circuit is used to filter the detection signal output by the temperature detection device and then output it to the control circuit.

10. A display device, characterized in that: The display device comprises the display control circuit according to any one of claims 1 to 9.

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