Display control board for improving photosensitive interference

Abstract

The utility model mainly relates to the technical field of display control boards, and provides a display control board capable of improving photosensitive interference in order to reduce adverse effects of power supply signals in the display control board integrated with a display and control part and an Internet of Things module on photosensitive signals of a photosensitive sensor. The display control board comprises an infrared receiving module, a photosensitive sensor, an IoT module, a driving integrated circuit and a power conversion circuit; the IoT module is connected with the driving integrated circuit through a UART transmission line, the display screen is connected with the driving integrated circuit through an I / O port, the IoT module is connected with the infrared receiving module and the photosensitive sensor through the I / O port, and the power supply supplies power to the infrared receiving module, the photosensitive sensor, the IoT module and the driving integrated circuit through the power conversion circuit. The distance between the power conversion circuit and the photosensitive sensor signal line and the distance between the power conversion circuit signal line and the photosensitive sensor signal line are not smaller than 10 times of the line width of the photosensitive sensor signal line.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of display and control panels, in particular to a display and control panel capable of improving photosensitivity interference. Background Art

[0002] It's becoming a trend in household appliances to integrate their display and control components with the IoT into a single control panel. For example, to attract customers, home air conditioners are constantly evolving in terms of design, appearance, and functionality. Intelligent air conditioners offer remote control, remote upgrades, remote fault analysis, and automatic adjustment of temperature, air speed, direction, and display brightness, providing users with significant convenience and enhanced user experience, earning increasing recognition. Networking is essential for smart air conditioners. Currently, most smart air conditioners on the market have separate display and control panels and IoT modules. However, with the pursuit of extreme cost reduction for the entire unit, there's a need to integrate the display and control components with the IoT module. This allows the IoT module's MCU to serve as the display and control processing unit, eliminating a control MCU and reducing wiring, connectors, and other materials, ultimately saving production costs. However, as the integration of the display and control parts with the IoT module becomes increasingly higher, signal interference will occur between sensitive device units such as photosensors and radio frequency components on the same display and control board. In the control board where the display and its control parts and the IoT are integrated, the light sensitivity value of the photosensor on the display and control board is calculated based on the voltage value collected by the ADC of the IoT module. This voltage value is between 40 and 120mV and is easily affected by the DC-DC power supply and power ripple. Utility Model Content

[0003] Technical problems to be solved by the utility model

[0004] A display and control board with improved photosensitivity interference is provided, aiming to reduce the adverse effects of the power supply signal on the photosensor's photosensor's photosensor and radio frequency performance in a display and control board integrating the display and its control part with an Internet of Things module.

[0005] The utility model solves the above technical problems by adopting the technical solution

[0006] A display and control board with improved photosensitivity interference and radio frequency performance, comprising an infrared receiving module, a photosensor, an IoT module, a driver integrated circuit, and a power conversion circuit; the driver integrated circuit comprising an IoT module driver circuit and a display screen driver circuit; the IoT module is connected to the driver integrated circuit via a UART transmission line, the display screen is connected to the driver integrated circuit via an I / O port, the IoT module is connected to the infrared receiving module and the photosensor via the I / O port, the power supply supplies power to the infrared receiving module, the photosensor, the IoT module, and the driver integrated circuit via a power conversion circuit, the power conversion circuit and the power conversion circuit signal line are arranged at the edge of the display and control board, and the distance from the photosensor signal line is not less than 10 times the line width of the photosensor signal line.

[0007] Furthermore, the power conversion circuit includes a DC-DC circuit and an LDO power regulator chip. One end of the DC-DC circuit is connected to the power supply for converting the power supply voltage to 5V. The other end of the DC-DC circuit is connected to the driver integrated circuit and the LDO power regulator chip. The LDO power regulator chip is used to reduce the 5V voltage to 3.3V. The other end of the LDO power regulator chip is connected to the infrared receiving module, the photosensor, and the IoT module.

[0008] Furthermore, a magnetic bead is connected in series between the LDO power supply voltage regulator chip and the photosensor, and a first capacitor, a second capacitor and a third capacitor are connected in parallel between the magnetic bead and the photosensor.

[0009] Furthermore, the light sensor signal line is enveloping on both sides.

[0010] Furthermore, the IoT module is surrounded by a copper foil clearance area of ​​at least 6.5mm, and the ground area of ​​the IoT module antenna area is not less than 180mm. 2 .

[0011] Furthermore, the bottom of the IoT module is copper-clad on both sides.

[0012] Beneficial effects of the utility model

[0013] This utility model describes a display and control board that improves photosensor interference by adjusting the power conversion circuit so that the distance between the edge of the display and control board and the photosensor signal line is at least 10 times the line width of the photosensor signal line. This minimizes the interference of the power supply signal on the photosensor, resulting in a more stable light reading. Furthermore, magnetic beads and capacitors are placed between the photosensor and the power supply circuit to adjust the photosensor filter parameters, minimizing photosensor ripple. Furthermore, grounding both sides of the photosensor signal further reduces power supply ripple and stabilizes the photosensor signal.

[0014] Based on the above improvements, the display and control board described in the present invention improves photosensitivity interference and radio frequency performance by increasing the clearance area around the IoT module, extending the grounding area and double-sided copper plating design, so that the radio frequency impedance of the display and control screen meets the 50 ohm requirement, forming an effective antenna radiation electromagnetic field, thereby improving the antenna efficiency and gain indicators. The TIS and TRP radio frequency indicators of the display and control screen are better, so that it can be applied to more complete machine products. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural block diagram of a display and control board for improving photosensitivity interference;

[0016] Figure 2 This is a schematic diagram of the location of the photosensitive signal line and the DC-DC circuit;

[0017] Figure 3 Schematic diagram of the LDO power regulator chip and photosensor; L1-ferrite bead, C1-first capacitor, C2-second capacitor, C3-third capacitor. DETAILED DESCRIPTION

[0018] like Figure 1 As shown, the display control board includes an infrared receiving module, a photosensor, an IoT module, a driver integrated circuit and a power conversion circuit; the driver integrated circuit includes an IoT module driver circuit and a display driver circuit. The IoT module is connected to the driver integrated circuit as the MCU main control unit through a UART transmission line. The display is connected to the driver integrated circuit through an I / O port and is connected by the display driver circuit. The IoT module is connected to the infrared receiving module and the photosensor through the IO port. The infrared receiving module receives remote control signals, and the photosensor receives the surrounding light and transmits the acquired light signal to the IoT module through the UART transmission line. The power conversion circuit includes a DC-DC circuit and an LDO power regulator chip. One end of the DC-DC circuit is connected to the power supply, and the other end is connected to the driver integrated circuit and the LDO power regulator chip, which is used to reduce the power supply voltage to 5V to power the driver integrated circuit and the LDO power supply. The LDO power regulator chip is connected to the infrared receiving module, the photosensor, and the IoT module, and is used to reduce the 5V voltage to 3.3V to power the infrared receiving module, the photosensor, and the IoT module. Adjust the position of the power conversion circuit to the edge of the display control board. Assuming that the width of the light-sensitive signal line is W, the power conversion circuit and its signal line are set at a distance of at least 10 times the width of the light-sensitive signal line from the light-sensitive sensor. That is, the distance between the power conversion circuit and its signal line and the light-sensitive sensor signal line is not less than 10W. Figure 2As shown, assuming that the line width W of the photosensitive signal is 0.2 mm, the distance between the power conversion circuit and its circuit signal line and the signal line of the photosensor should be at least greater than 2 mm to minimize the interference of the power conversion circuit on the photosensitive signal.

[0019] Further, such as Figure 3 As shown, a magnetic bead L1 is added between the photosensor and the LDO power supply voltage regulator chip, and a first capacitor C1, a second capacitor C2, and a third capacitor C3 are connected in parallel between the magnetic bead L1 and the photosensor for filtering. The impedance of the magnetic bead L1 is 3216 size 1KΩ, the first capacitor C1 is 0402 size 1nF, the second capacitor C2 is 0402 size 2.2uF, and the third capacitor C3 is 0805 size 47uF, so that the ripple of the LDO power supply voltage regulator chip is in a smaller state. At the same time, the ground wires are enveloping both sides of the photosensitive signal line to increase the stability of the photosensitive signal.

[0020] Based on antenna simulation and simulation testing of the IoT module, in order to improve the RF performance of the display and control board and achieve better sensitivity and anti-interference capabilities, the clearance area around the IoT module antenna is improved, the ground area is extended, and a double-sided copper plating design is implemented. Specifically, a clearance area of ​​at least 6.5mm copper foil is set around the IoT module, and the ground area of ​​the IoT module antenna area is not less than 180mm. 2 The RF impedance meets the 50 ohm requirement, which can form an effective antenna radiation electromagnetic field, thereby improving the antenna efficiency and gain indicators, making the TIS and TRP RF indicators of the display and control board better and applicable to more complete products.

Claims

1. A display control board for improving photosensitivity interference, characterized in that: The display and control board includes an infrared receiving module, a photosensor, an IoT module, a driving integrated circuit and a power conversion circuit; the driving integrated circuit includes an IoT module driving circuit and a display screen driving circuit. The IoT module is connected to the driving integrated circuit through a UART transmission line, the display screen is connected to the driving integrated circuit through an I / O port, and the IoT module is connected to the infrared receiving module and the photosensor through the I / O port. The power supply supplies power to the infrared receiving module, photosensor, IoT module and driving integrated circuit through the power conversion circuit. The power conversion circuit and the power conversion circuit signal line are set at the edge of the display and control board, and the distance from the photosensor signal line is not less than 10 times the line width of the photosensor signal line.

2. A display control board for improving photosensitivity interference according to claim 1, characterized in that: The power conversion circuit includes a DC-DC circuit and an LDO power regulator chip. One end of the DC-DC circuit is connected to the power supply and is used to convert the power supply voltage into 5V. The other end of the DC-DC circuit is connected to the driver integrated circuit and the LDO power regulator chip. The LDO power regulator chip is used to reduce the 5V voltage to 3.3V. The other end of the LDO power regulator chip is connected to the infrared receiving module, the photosensor, and the IoT module.

3. The display control board for improving photosensitivity interference according to claim 2, characterized in that: A magnetic bead is connected in series between the LDO power supply voltage regulator chip and the photosensor, and a first capacitor, a second capacitor and a third capacitor are connected in parallel between the magnetic bead and the photosensor.

4. A display control board for improving photosensitivity interference according to claim 3, characterized in that: The light sensor signal line is enveloping on both sides.

5. A display control board for improving photosensitivity interference according to any one of claims 1 to 4, characterized in that: The IoT module must be surrounded by a copper foil clearance area of ​​at least 6.5 mm, and the ground area of ​​the IoT module antenna must be no less than 180 mm. 2 .

6. A display control board for improving photosensitivity interference according to any one of claims 1 to 4, characterized in that: The bottom of the IoT module is copper-clad on both sides.

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