Display screen controller for preventing myopia

Abstract

The utility model provides a display screen controller for preventing myopia, and relates to the technical field of display screen controllers, four groups of detection devices are arranged at the periphery of a display screen, each group comprises two groups of sensing units, and the infrared distance measurement technology is adopted, so that the accurate monitoring of the distance between a user and the display screen is realized. The design of the double sensing units greatly reduces the possibility of false alarm and missing alarm, and improves the monitoring accuracy. When it is detected that the user is too close to the display screen, the control device can rapidly cut off a power supply of the display screen, and myopia is effectively prevented. And meanwhile, the integrated indicator lamp design is more convenient for users to observe, so that the users can intuitively know the working state of the equipment. The improvements not only improve the functionality and reliability of the display screen controller, but also improve the user experience.

Description

Technical Field

[0001] The utility model relates to the technical field of display screen controllers, in particular to a display screen controller for preventing myopia. Background Art

[0002] With the popularity of electronic devices, long hours in front of display screens have become the norm in modern life, which not only increases the risk of myopia, but may also cause other visual problems. Traditional display controllers usually lack an effective user distance monitoring mechanism and cannot promptly remind or take measures when the user is too close to the display screen, thus failing to effectively prevent myopia. In addition, existing distance monitoring technologies often rely on a single sensor and are easily affected by environmental factors, resulting in false alarms or missed alarms, affecting user experience.

[0003] For example, a new type of anti-myopia laptop display screen published by Chinese patent publication number CN215416453U can detect the distance between the user and the display screen through an infrared ranging sensor and then issue an alarm, but it still relies on a single sensor. Not only is the detection range small, but if it is blocked by debris, it is also prone to false alarms, affecting the user experience.

[0004] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not constitute the prior art that is already known to one of ordinary skill in the art. Utility Model Content

[0005] The purpose of the utility model is to provide a display screen controller for preventing myopia, so as to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A display screen controller for preventing myopia, comprising: four sets of detection devices, an analysis device, and a control device;

[0008] The detection device is provided with two sets of identical sensor units, and the sensor units are electrically connected to the analysis device through signal lines;

[0009] The analysis device comprises an external housing and a working circuit, wherein the working circuit is used to detect the electrical signals of the two groups of sensor units in each group of detection devices, and when the two groups of sensor units both output high levels, the high level is sent to the control device;

[0010] The control device is a relay with normally closed contacts, which is driven by a transistor and is arranged between the display screen power supply and the external power supply, and is used to disconnect the display screen power supply and the external power supply when the working circuit sends a high level.

[0011] Preferably, a clamp is provided on the lower side of the detection device and the analysis device, and the clamp includes a fixed plate and a movable plate, the fixed plate is fixedly connected to the detection device and the lower side of the external shell, one side of the fixed plate is fixedly connected to two guide rods, the guide rods pass through the movable plate and are slidably connected to the movable plate, a threaded rod is also provided between the two guide rods, a smooth end of the threaded rod is rotatably connected to the fixed plate, a threaded hole is provided in the middle of the movable plate, the threaded rod passes through the threaded hole and is threadedly connected to the movable plate.

[0012] Preferably, a flexible plastic clip is provided on one side of the detection device for clamping on the four edges of the display screen for fixing; a flexible plastic clip is also provided on one side of the external shell for fixing on the top of the display screen.

[0013] Preferably, the display screen controller further includes a power supply module, and the power supply module includes a step-down circuit for connecting to an external power source and stepping down the external power source to supply energy to the entire display screen controller.

[0014] Preferably, the sensing unit is an infrared ranging sensor, which is used to output an electrical signal of corresponding strength according to the distance between the user and the display screen.

[0015] Preferably, the working circuit comprises:

[0016] Eight groups of A / D conversion modules, each of which is arranged in a one-to-one correspondence with the sensor unit and is electrically connected to the sensor unit, and is used to perform digital-to-analog conversion on the electrical signal output by the sensor unit;

[0017] Eight groups of voltage comparison modules, wherein the voltage comparison modules are arranged in one-to-one correspondence with the A / D conversion modules, the two input terminals of the voltage comparison modules are respectively connected to the output terminal of the A / D conversion module and the reference voltage terminal preset by the user, and the output terminal is electrically connected to the logic module;

[0018] Four groups of logic modules, each group of logic modules is arranged corresponding to the two groups of sensor units in each group of detection devices, and is used to detect the electrical signals of the two groups of sensor units. When the two groups of sensor units both output a high level, the logic module outputs a high level, otherwise it outputs a low level;

[0019] The data analysis module is electrically connected to the four logic modules and the driving end of the relay, and is used to output a high level to turn on the driving end of the relay to disconnect the relay when two sensor units in any logic module output a high level at the same time.

[0020] Preferably, the logic module includes an XNOR gate and an AND gate. The electrical signals of the two groups of sensor units pass through the A / D module and the voltage comparison module and are then electrically connected to the two input ends of the XNOR gate respectively. The output end of the XNOR gate is electrically connected to one of the input ends of the AND gate, and the other input end of the AND gate is electrically connected to any input end of the XNOR gate. The output end of the AND gate is electrically connected to the data analysis module.

[0021] Preferably, the logic module further includes an indicator light, one end of the indicator light is electrically connected to the output end of the XNOR gate, and the other end of the indicator light is grounded.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] The utility model realizes accurate monitoring of the distance between the user and the display screen by arranging four groups of detection devices around the display screen, each group including two groups of sensor units, and adopting infrared ranging technology. The design of this dual sensor unit greatly reduces the possibility of false alarms and missed alarms, and improves the accuracy of monitoring. When it is detected that the user is too close to the display screen, the control device can quickly cut off the power supply of the display screen, effectively preventing the occurrence of myopia. At the same time, the integrated indicator light design is more convenient for users to observe, so that users can intuitively understand the working status of the device. These improvements not only improve the functionality and reliability of the display screen controller, but also improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the circuit structure of the utility model;

[0025] Figure 2 This is a schematic diagram of the circuit structure of the control module of the utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the detection device of the utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the analysis device of the utility model.

[0028] In the figure: 1. detection device; 11. sensing unit; 2. analysis device; 21. external housing; 22. working circuit; 31. fixed plate; 32. movable plate; 33. guide rod; 34. threaded rod. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0030] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0031] Example:

[0032] See also Figure 1 to Figure 4 , the utility model provides a technical solution:

[0033] A display screen controller for preventing myopia comprises: four groups of detection devices 1, an analysis device 2, and a control device.

[0034] The detection devices 1 are all hollow structures, with two identical sensor units 11 arranged inside. A flexible plastic clip is arranged on one side of the detection device 1, which is used to clamp on the four edges of the display screen for fixing, so that no matter from which direction the user approaches the display screen, the detection device 1 at the corresponding position can detect it, which has the effect of increasing the detection range. The sensor unit 11 can adopt a Sharp GP2Y0A21YK0F series infrared distance sensor, which can measure the distance range between 10cm and 80cm, has high accuracy and fast response speed. The infrared distance sensor is electrically connected to the analysis device 2 through a signal line, and is used to measure the distance between the user and the display screen, and convert it into an electrical signal and send it to the analysis device 2.

[0035] A clamp is provided on the lower side of the detection device 1 and the analysis device 2, and the clamp includes a fixed plate 31 and a movable plate 32. The fixed plate 31 is fixedly connected to the detection device 1 and the lower side of the external shell 21, and two guide rods 33 are fixedly connected to one side of the fixed plate 31. The guide rods 33 pass through the movable plate 32 and are slidably connected to the movable plate 32. A threaded rod 34 is also provided between the two guide rods 33, and a smooth end of the threaded rod 34 is rotatably connected to the fixed plate 31. A threaded hole is provided in the middle of the movable plate, and the threaded rod 34 passes through the threaded hole and is threadedly connected to the movable plate.

[0036] In this step, the detection device 1 can be set as a plastic shell with a clamp. By rotating the threaded rod 34, the threaded rod 34 can drive the movable plate 32 to slide along the guide rod 33 in a threaded motion, thereby clamping the edge of the display screen. A flexible sponge pad can also be set on the inner side of the fixed plate 31 and the movable plate 32 to avoid scratching the edge of the display screen due to excessive clamping. It is used to fix the two sets of sensor units 11, play a supporting and protective role, and prevent the sensor units 11 from shaking during measurement, resulting in reduced measurement effect. The design of the flexible plastic clamp makes the controller suitable for display screens of various sizes, expanding the market application range of the product. The basic principle of the infrared ranging sensor is to emit infrared light. When the infrared beam encounters an object, it will be reflected back and received by the infrared receiver (usually a photodiode or photoresistor) in the infrared ranging sensor. The receiver converts the optical signal into an electrical signal, which is then processed by the circuit inside the sensor. This circuit analyzes the intensity and time delay of the signal to calculate the distance between the object and the sensor. As the object approaches the sensor, the intensity of the reflected infrared beam increases. This is because the propagation path of the light beam becomes shorter and the energy loss is reduced, so more light energy is captured by the receiver. In other words, when the user approaches the display screen, the electrical signal output by the sensor unit 11 will also be enhanced.

[0037] The analysis device 2 includes an external shell 21 and a working circuit 22. The working circuit 22 is installed in the external shell 21 by being integrated on a PCB board. The external shell 21 is used to support and protect the working circuit 22. A flexible plastic clip is also provided on one side of the external shell 21 for fixing it on the top of the display screen. The working circuit 22 is used to detect the electrical signals of the two groups of sensor units 11 in each group of detection devices 1. When both groups of sensor units 11 output a high level, a high level is sent to the control device.

[0038] The working circuit 22 comprises:

[0039] Eight groups of A / D conversion modules, wherein the A / D conversion modules can adopt 8-bit analog-to-digital converters of the ADC0804LCN model, are arranged one-to-one with the sensor units 11 and electrically connected, and are used to perform digital-to-analog conversion on the electrical signals output by the sensor units 11. By separately setting an A / D conversion module for each group of sensor units 11, signal interference can be reduced and false alarms and the like can be avoided.

[0040] Eight groups of voltage comparison modules, the voltage comparison modules are set one by one with the A / D conversion modules, the voltage comparison modules can use a voltage comparator of model LM339, the two input ends are respectively connected to the output end of the A / D conversion module and the reference voltage end preset by the user, the reference voltage is Vp, and the output end is electrically connected to the logic module. When the signal voltage after A / D conversion is higher or lower than the reference voltage, the voltage comparator will output the corresponding logic level (high or low), and this logic level is then sent to the logic module for further processing.

[0041] Four groups of logic modules, each group of logic modules is set corresponding to the two groups of sensor units 11 in each group of detection devices 1, and is used to detect the electrical signals of the two groups of sensor units 11. When the two groups of sensor units 11 both output high level, the logic module outputs high level, otherwise it outputs low level.

[0042] The logic module includes an XNOR gate and an AND gate, which can respectively adopt an XNOR gate chip of model 74HC86 and an AND gate chip of model 74HC08. The electrical signals of the two groups of sensor units 11 pass through the A / D module and the voltage comparison module, and then are electrically connected to the two input ends of the XNOR gate respectively. The output end of the XNOR gate is electrically connected to one of the input ends of the AND gate, and the other input end of the AND gate is electrically connected to any input end of the XNOR gate. The output end of the AND gate is electrically connected to the data analysis module.

[0043] The logic module also includes an indicator light, one end of which is electrically connected to the output end of the XNOR gate, and the other end of which is grounded.

[0044] A data analysis module is electrically connected to the four groups of logic modules and the driving end of the relay, and uses a microcontroller of model ATmega328P. The microcontroller has sufficient processing power to analyze the output of the logic module and control the driving end of the relay. The data analysis module is used to output a high level to turn on the driving end of the relay to disconnect the relay when the two groups of sensor units 11 in any logic module output a high level at the same time.

[0045] The display screen controller also includes a power supply module, which uses an LM2596 adjustable buck regulator and has a buck circuit inside, which is used to connect to an external power supply and supply energy to the entire display screen controller after stepping down the external power supply.

[0046] The control device is a relay with a normally closed contact. The relay is arranged between the display screen power supply and the external power supply, and is used to disconnect the connection between the display screen power supply and the external power supply when the working circuit 22 sends a high level. The relay can be a normally closed relay of model G5NB-140T DC5. When the relay is not powered on, its normally closed contact remains in a closed state, allowing current to pass through, thereby keeping the display screen power supply connected. When the control circuit sends a control signal through the microcontroller ATmega328P to energize the relay coil, the normally closed contact is disconnected, and the display screen power supply is cut off. In order to achieve this function, an NPN transistor can be used as the driving end of the relay for driving, one end of the relay is connected to the output end of the power supply module, and the other end is connected to the collector of the NPN transistor. The emitter of the NPN transistor is grounded, and the base is connected to the data analysis module. When the data analysis module outputs a high level, the NPN transistor is turned on, and the relay is pulled in so that the normally closed contact is disconnected, thereby cutting off the display screen power supply. Since using the NPN transistor as the driving end of the relay is a commonly used technical means in this field, it is not repeated here.

[0047] It is not difficult to see from the above circuit connection that in normal use, it is divided into the following situations:

[0048] When the user's face is not close to the display screen, both sets of sensor units 11 output low level, the two input ends of the OR gate are low level, so the output end is high level, and the indicator light is on to indicate normal operation. The input end levels of the AND gate are one high and one low, so the output end is low level, the relay is closed, and the display screen is on.

[0049] When the user's face is close to the display screen, both sets of sensor units 11 output high level, the two input ends of the OR gate are two high levels, so the output end is high level, the indicator light is on, indicating normal operation, the input end level of the AND gate is two high levels, so the output end is high level, the relay is disconnected, and the display screen is on.

[0050] When the indicator light is off, it is considered that an abnormality has occurred, and the levels of the two input terminals of the OR gate are one high and one low. At this time, it can be checked whether there are objects such as water cups and paper boxes blocking the display screen corresponding to the group of detection devices 1. If there is no obstruction, or the indicator light is still off after the water cups, paper boxes and other objects are removed, it is considered that the sensor unit 11 of the group of detection devices 1 has a fault.

[0051] Since cups and paper boxes are usually placed on both sides of the display screen on the computer desk, these items are much lower than the user's face. In the detection device 1 installed on both sides of the display screen, the lower sensor units 11 are easily blocked by these items and output high voltage. If only the detection result of a single sensor unit 11 is used as the judgment basis, it is easy to directly turn off the display screen when a lower sensor unit 11 is blocked, that is, a false alarm is generated, which greatly affects the user experience. Therefore, the method of using two groups of sensor units 11 for joint detection can reduce the risk of false alarms.

[0052] It is understandable that in order to observe whether the equipment is working properly, the indicator light generally needs to be always on. In the present utility model, in order to facilitate the user to directly observe the indicator light at a glance, four groups of indicator lights are integrated on the analysis device 2, rather than being dispersedly arranged on the detection device 1 on the four sides of the display screen. At the same time, considering that when integrated together, too many indicator lights will not only easily distract the user's attention due to excessive brightness, but also make it difficult for the user to distinguish the position of the sensor unit 11 corresponding to each indicator light. Therefore, after comprehensive consideration, a method of using a group of indicator lights corresponding to a group of detection devices 1 is used, rather than using a group of indicator lights corresponding to a group of sensor units 11. A group of indicator lights can comprehensively reflect the working conditions of the two sensor units 11, which is not only convenient for users to observe intuitively at a glance, but also can more easily identify the corresponding relationship between the indicator lights and the detection device 1, thereby improving the user experience. At the same time, four groups of indicator lights that are always on are also less power-efficient and more energy-efficient than eight groups of indicator lights.

[0053] In summary, the utility model realizes accurate monitoring of the distance between the user and the display screen by arranging four groups of detection devices around the display screen, each group including two groups of sensor units, and adopting infrared ranging technology. The design of this dual sensor unit greatly reduces the possibility of false alarms and missed alarms, and improves the accuracy of monitoring. When it is detected that the user is too close to the display screen, the control device can quickly cut off the power supply of the display screen, effectively preventing the occurrence of myopia. At the same time, the integrated indicator light design is more convenient for users to observe, so that users can intuitively understand the working status of the device. These improvements not only improve the functionality and reliability of the display screen controller, but also improve the user experience.

[0054] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A display screen controller for preventing myopia, characterized in that: include: Four sets of detection devices, analysis devices, and control devices; The detection device is provided with two sets of identical sensor units, and the sensor units are electrically connected to the analysis device through signal lines; The analysis device comprises an external housing and a working circuit, wherein the working circuit is used to detect the electrical signals of the two groups of sensor units in each group of detection devices, and when the two groups of sensor units both output high levels, the high level is sent to the control device; The control device is a relay with normally closed contacts, which is driven by a transistor and is arranged between the display screen power supply and the external power supply, and is used to disconnect the display screen power supply and the external power supply when the working circuit sends a high level.

2. A display screen controller for preventing myopia according to claim 1, characterized in that: A clamp is provided on the lower side of the detection device and the analysis device, and the clamp includes a fixed plate and a movable plate. The fixed plate is fixedly connected to the detection device and the lower side of the external shell, and two guide rods are fixedly connected to one side of the fixed plate, and the guide rods pass through the movable plate and are slidably connected to the movable plate. A threaded rod is also provided between the two guide rods, and a smooth end of the threaded rod is rotatably connected to the fixed plate. A threaded hole is provided in the middle of the movable plate, and the threaded rod passes through the threaded hole and is threadedly connected to the movable plate.

3. A display screen controller for preventing myopia according to claim 1, characterized in that: The display screen controller also includes a power supply module, which includes a step-down circuit for connecting to an external power source and stepping down the external power source to supply energy to the entire display screen controller.

4. A display screen controller for preventing myopia according to claim 1, characterized in that: The sensing unit is an infrared distance measuring sensor, which is used to output an electrical signal of corresponding strength according to the distance between the user and the display screen.

5. A display screen controller for preventing myopia according to claim 4, characterized in that: The working circuit comprises: Eight groups of A / D conversion modules, each of which is arranged in a one-to-one correspondence with the sensor unit and is electrically connected to the sensor unit, and is used to perform digital-to-analog conversion on the electrical signal output by the sensor unit; Eight groups of voltage comparison modules, wherein the voltage comparison modules are arranged in one-to-one correspondence with the A / D conversion modules, the two input terminals of the voltage comparison modules are respectively connected to the output terminal of the A / D conversion module and the reference voltage terminal preset by the user, and the output terminal is electrically connected to the logic module; Four groups of logic modules, each group of logic modules is arranged corresponding to the two groups of sensor units in each group of detection devices, and is used to detect the electrical signals of the two groups of sensor units. When the two groups of sensor units both output a high level, the logic module outputs a high level, otherwise it outputs a low level; The data analysis module is electrically connected to the four logic modules and the driving end of the relay, and is used to output a high level to turn on the driving end of the relay to disconnect the relay when two sensor units in any logic module output a high level at the same time.

6. A display screen controller for preventing myopia according to claim 5, characterized in that: The logic module includes an XNOR gate and an AND gate. The electrical signals of the two groups of sensor units pass through the A / D module and the voltage comparison module and are then electrically connected to the two input ends of the XNOR gate respectively. The output end of the XNOR gate is electrically connected to one of the input ends of the AND gate, and the other input end of the AND gate is electrically connected to any input end of the XNOR gate. The output end of the AND gate is electrically connected to the data analysis module.

7. A display screen controller for preventing myopia according to claim 6, characterized in that: The logic module also includes an indicator light, one end of which is electrically connected to the output end of the XNOR gate, and the other end of which is grounded.

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